I get something simlar with Flutter v3.13.9.

Error (Xcode): ../../.pub-cache/hosted/pub.dev/fl_chart-0.65.0/lib/src/chart/bar_chart/bar_chart_renderer.dart:42:5: Error: Type 'TextScaler' not found.

I assume TextScaler only became available in 3.16.0

I was having the similar issue. I then upgraded flutter using flutter upgrade and my issue got resolved.

@imaNNeo a Flutter/Dart SDK version constraint should probably be added to 0.65.0 to avoid this issue, i.e.

environment:
  sdk: ^3.2.0
  flutter: ^3.16.0

I am facing a similar issue, I tried a custom widget in Flutterflow. I was using the "import 'package:fl_chart/fl_chart.dart';" package and it worked fine but since yesterday or so, I have been facing issues in deploying the same custom widget which worked earlier.

errors:
"bar_chart_renderer.dart:42:5: Error: Type 'TextScaler' not found.
TextScaler textScaler,"
"line_chart_renderer.dart:75:18: Error: Type 'TextScaler' not found.
set textScaler(TextScaler value) {"

"radar_chart_renderer.dart:74:18: Error: Type 'TextScaler' not found.
set textScaler(TextScaler value) {"

It seems like a library dependency issue because it is trying to search textScaler in even charts I am not using like radar. Also, it was working earlier for me. I am using Flutter 3.17.7 Flutterflow v4.0 (above suggestion did not helped for me)

@imaNNeo a Flutter/Dart SDK version constraint should probably be added to 0.65.0 to avoid this issue, i.e.

environment:
  sdk: ^3.2.0
  flutter: ^3.16.0

You're right. I forgot to do that.
Sorry about that guys, please downgrade your fl_chart version to the previous version, or upgrade your flutter to the latest version to use the latest fl_chart version.

Fixed in the 0.66.0 release.