I'm running OwlPlug v1.29.0 on Mac OS 11.7.6 (20G1231). OwlPlug is in the Applications directory and this is the first time I've ran the app, no previous scans. My plug-ins are in the default locations:
/Library/Audio/Plug-ins/VST
/Library/Audio/Plug-ins/VST3

I started with running Native but it crashed a lot on common plug-ins such as Arturia, NI, etc. So I switched that off. OwlPlug seems to know it was a problem due to Native. Could it automatically deal with the error and continue scanning rather than crashing?

I've since tried to sync dozens of times. Some times it errors right away, other times it runs for minutes before erroring. The message is always the same: "Plugins synchronization failed. Check your plugin directory.". The plugin locations in settings are correct. I do have plugins in sub folders by category, such as synths, drums, etc. Could that be the problem? Looks like a java source error possibly. Below is a log from the last time a ran it.

Great looking app! Thanks for making it available. I'm anxious to try it after a sync will complete.

12566373 INFO c.owlplug.core.tasks.PluginSyncTask - Plugin Sync task started
12568465 INFO c.owlplug.core.tasks.PluginSyncTask - 1481 plugins collected
[Fatal Error] :33:28: An invalid XML character (Unicode: 0x12) was found in the element content of the document.
12622699 ERROR c.o.c.t.p.d.f.OsxPlistFile - Error while binding plugin properties from Plist file
org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0x12) was found in the element content of the document.
at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at java.xml/javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
at com.dd.plist.XMLPropertyListParser.parse(XMLPropertyListParser.java:178)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:251)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:209)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:192)
at com.owlplug.core.tasks.plugins.discovery.fileformats.OsxPlistFile.bindProperties(OsxPlistFile.java:49)
at com.owlplug.core.tasks.plugins.discovery.fileformats.Vst3BundleFile.toPlugin(Vst3BundleFile.java:61)
at com.owlplug.core.tasks.PluginSyncTask.start(PluginSyncTask.java:175)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:51)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:28)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1399)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
[Fatal Error] :30:5: The element type "string" must be terminated by the matching end-tag "".
12697849 ERROR c.o.c.t.p.d.f.OsxPlistFile - Error while binding plugin properties from Plist file
org.xml.sax.SAXParseException: The element type "string" must be terminated by the matching end-tag "".
at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at java.xml/javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
at com.dd.plist.XMLPropertyListParser.parse(XMLPropertyListParser.java:178)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:251)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:209)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:192)
at com.owlplug.core.tasks.plugins.discovery.fileformats.OsxPlistFile.bindProperties(OsxPlistFile.java:49)
at com.owlplug.core.tasks.plugins.discovery.fileformats.Vst3BundleFile.toPlugin(Vst3BundleFile.java:61)
at com.owlplug.core.tasks.PluginSyncTask.start(PluginSyncTask.java:175)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:51)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:28)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1399)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
[Fatal Error] :30:5: The element type "string" must be terminated by the matching end-tag "".
12697982 ERROR c.o.c.t.p.d.f.OsxPlistFile - Error while binding plugin properties from Plist file
org.xml.sax.SAXParseException: The element type "string" must be terminated by the matching end-tag "".
at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at java.xml/javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
at com.dd.plist.XMLPropertyListParser.parse(XMLPropertyListParser.java:178)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:251)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:209)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:192)
at com.owlplug.core.tasks.plugins.discovery.fileformats.OsxPlistFile.bindProperties(OsxPlistFile.java:49)
at com.owlplug.core.tasks.plugins.discovery.fileformats.Vst3BundleFile.toPlugin(Vst3BundleFile.java:61)
at com.owlplug.core.tasks.PluginSyncTask.start(PluginSyncTask.java:175)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:51)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:28)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1399)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
[Fatal Error] :33:28: An invalid XML character (Unicode: 0x12) was found in the element content of the document.
12826934 ERROR c.o.c.t.p.d.f.OsxPlistFile - Error while binding plugin properties from Plist file
org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0x12) was found in the element content of the document.
at java.xml/com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at java.xml/com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at java.xml/javax.xml.parsers.DocumentBuilder.parse(Unknown Source)
at com.dd.plist.XMLPropertyListParser.parse(XMLPropertyListParser.java:178)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:251)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:209)
at com.dd.plist.PropertyListParser.parse(PropertyListParser.java:192)
at com.owlplug.core.tasks.plugins.discovery.fileformats.OsxPlistFile.bindProperties(OsxPlistFile.java:49)
at com.owlplug.core.tasks.plugins.discovery.fileformats.OsxVstFile.toPlugin(OsxVstFile.java:56)
at com.owlplug.core.tasks.PluginSyncTask.start(PluginSyncTask.java:175)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:51)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:28)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1399)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
12883350 ERROR c.owlplug.core.tasks.PluginSyncTask - Plugins synchronization failed
org.springframework.dao.DataIntegrityViolationException: could not execute statement [Unique index or primary key violation: "PRIMARY KEY ON PUBLIC.PLUGIN_FOOTPRINT(ID) ( /* key:0 / CAST(1669 AS BIGINT), TRUE, '/Library/Audio/Plug-ins/VST3/Delay TAPE-201.vst3')"; SQL statement:
insert into plugin_footprint (native_discovery_enabled,path,id) values (?,?,?) [23505-232]] [insert into plugin_footprint (native_discovery_enabled,path,id) values (?,?,?)]; SQL [insert into plugin_footprint (native_discovery_enabled,path,id) values (?,?,?)]; constraint [PRIMARY KEY]
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:290)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:241)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:566)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:795)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:758)
at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:698)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:416)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:138)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:165)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:223)
at jdk.proxy2/jdk.proxy2.$Proxy135.save(Unknown Source)
at com.owlplug.core.tasks.PluginSyncTask.start(PluginSyncTask.java:181)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:51)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:28)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1399)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement [Unique index or primary key violation: "PRIMARY KEY ON PUBLIC.PLUGIN_FOOTPRINT(ID) ( / key:0 / CAST(1669 AS BIGINT), TRUE, '/Library/Audio/Plug-ins/VST3/Delay TAPE-201.vst3')"; SQL statement:
insert into plugin_footprint (native_discovery_enabled,path,id) values (?,?,?) [23505-232]] [insert into plugin_footprint (native_discovery_enabled,path,id) values (?,?,?)]
at org.hibernate.dialect.H2Dialect.lambda$buildSQLExceptionConversionDelegate$3(H2Dialect.java:759)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:58)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:108)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:197)
at org.hibernate.engine.jdbc.mutation.internal.AbstractMutationExecutor.performNonBatchedMutation(AbstractMutationExecutor.java:134)
at org.hibernate.engine.jdbc.mutation.internal.MutationExecutorSingleNonBatched.performNonBatchedOperations(MutationExecutorSingleNonBatched.java:55)
at org.hibernate.engine.jdbc.mutation.internal.AbstractMutationExecutor.execute(AbstractMutationExecutor.java:55)
at org.hibernate.persister.entity.mutation.InsertCoordinatorStandard.doStaticInserts(InsertCoordinatorStandard.java:194)
at org.hibernate.persister.entity.mutation.InsertCoordinatorStandard.coordinateInsert(InsertCoordinatorStandard.java:132)
at org.hibernate.persister.entity.mutation.InsertCoordinatorStandard.insert(InsertCoordinatorStandard.java:104)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:110)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:644)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:511)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:414)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:41)
at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:127)
at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1429)
at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:491)
at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:2354)
at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:1978)
at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:439)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:169)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:267)
at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101)
at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:562)
... 20 common frames omitted
Caused by: org.h2.jdbc.JdbcSQLIntegrityConstraintViolationException: Unique index or primary key violation: "PRIMARY KEY ON PUBLIC.PLUGIN_FOOTPRINT(ID) ( / key:0 */ CAST(1669 AS BIGINT), TRUE, '/Library/Audio/Plug-ins/VST3/Delay TAPE-201.vst3')"; SQL statement:
insert into plugin_footprint (native_discovery_enabled,path,id) values (?,?,?) [23505-232]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:520)
at org.h2.message.DbException.getJdbcSQLException(DbException.java:489)
at org.h2.message.DbException.get(DbException.java:223)
at org.h2.message.DbException.get(DbException.java:199)
at org.h2.mvstore.db.MVPrimaryIndex.add(MVPrimaryIndex.java:121)
at org.h2.mvstore.db.MVTable.addRow(MVTable.java:517)
at org.h2.command.dml.Insert.insertRows(Insert.java:174)
at org.h2.command.dml.Insert.update(Insert.java:135)
at org.h2.command.dml.DataChangeStatement.update(DataChangeStatement.java:74)
at org.h2.command.CommandContainer.update(CommandContainer.java:139)
at org.h2.command.Command.executeUpdate(Command.java:304)
at org.h2.command.Command.executeUpdate(Command.java:248)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:213)
at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:172)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:194)
... 41 common frames omitted
12883351 ERROR c.o.core.components.TaskRunner - Error while running task
com.owlplug.core.tasks.TaskException: Plugins synchronization failed
at com.owlplug.core.tasks.PluginSyncTask.start(PluginSyncTask.java:227)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:51)
at com.owlplug.core.tasks.AbstractTask.call(AbstractTask.java:28)
at javafx.concurrent.Task$TaskCallable.call(Task.java:1399)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)