Any update on this topic as I am experiencing the same issue with buster and python 3.7? 2019-11-28 16:10:07.538 (Weer Buienradar) Retrieve weather data from http://xml.buienradar.nl/ 2019-11-28 16:10:07.635 Error: Domoticz(pid:502, tid:507('PluginMgr')) received fatal signal 6 (Aborted) 2019-11-28 ...

Got it to work again by updating the python path by adding the following lines in the beginning of the plugin.py before the import requests call is made

Same issue here installed the pip requests however still the same result 2019-05-04 16:02:50.161 Error: (Buienradar) failed to load 'plugin.py', Python Path used was '/home/pi/domoticz/plugins/domoticz-buienradar/:/usr/lib/python35.zip:/usr/lib/python3.5:/usr/lib/python3.5/plat-arm-linux-gnueabihf ...