Since I have installed the latest version of HA, the Zigbee2MQTT devices do not work for me. When I want to reinitialize the ZIGBEE2MQTT it doesn’t let me. Does anyone have any clue how to fix it? Thank you!!
Coming from which version?
If you show your actual configuration for Z2M maybe 
1.28.0-1
Updated Zigbee2MQTT to version 1.28.0
Fix Can’t open config file at null/configuration.yaml error
1.27.2-1