data_req = DataRequest(source='cryptocompare',
tickers=tickers,
fields=['tfr_val_mean'],
freq='d')

Exception Traceback (most recent call last)
Cell In [565], line 1
----> 1 cc_tfr_val_df = GetData(data_req).get_series()

File ~/projects/systamental/cryptodatapy/src/cryptodatapy/extract/getdata.py:220, in GetData.get_series(self, method)
218 ds = ds()
219 # get data
--> 220 df = getattr(ds, method)(self.data_req)
222 return df

File ~/projects/systamental/cryptodatapy/src/cryptodatapy/extract/data_vendors/cryptocompare_api.py:838, in CryptoCompare.get_data(self, data_req)
836 # check if df empty
837 if df.empty:
--> 838 raise Exception('No data returned. Check data request parameters and try again.')
840 # filter df for desired fields and sort index by date
841 fields = [field for field in data_req.fields if field in df.columns]

Exception: No data returned. Check data request parameters and try again.