getting an error

[GoSEHawks]

tidepool.py:363: FutureWarning: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.
self.data = self.data.append(rowdata, ignore_index=True)
Traceback (most recent call last):
File "tidepool.py", line 519, in
main()
File "tidepool.py", line 515, in main
m.runBot()
File "tidepool.py", line 474, in runBot
self.data = self.updateDataframe(now)
File "tidepool.py", line 370, in updateDataframe
self.data[colName] = talib.RSI(self.data[c].values, timeperiod = self.rsiWindow)
File "/home/mandi/.local/lib/python3.8/site-packages/talib/init.py", line 64, in wrapper
result = func(*_args, **_kwds)
File "talib/_func.pxi", line 4375, in talib._ta_lib.RSI
File "talib/_func.pxi", line 22, in talib._ta_lib.check_array
Exception: input array type is not double