Can't get it working

[iGit-iGit-oGott]

I've followed the readme. but in the end I'm getting this error. Scanning the device works fine.

Linux raspberrypi 5.4.83+ #1379 Mon Dec 14 13:06:05 GMT 2020 armv6l GNU/Linux
Python 2.7.16

Traceback (most recent call last):
File "read_waveplus.py", line 221, in
waveplus.connect()
File "read_waveplus.py", line 139, in connect
self.curr_val_char = self.periph.getCharacteristics(uuid=self.uuid)[0]
File "/usr/local/lib/python2.7/dist-packages/bluepy/btle.py", line 475, in getCharacteristics
rsp = self._getResp('find')
File "/usr/local/lib/python2.7/dist-packages/bluepy/btle.py", line 377, in _getResp
resp = self._waitResp(wantType + ['ntfy', 'ind'], timeout)
File "/usr/local/lib/python2.7/dist-packages/bluepy/btle.py", line 340, in _waitResp
raise BTLEException(BTLEException.COMM_ERROR, "Error from Bluetooth stack (%s)" % errcode)
bluepy.btle.BTLEException: Error from Bluetooth stack (comerr)