Cant Add deCONZ integration

HI there!
I am new to HA and i am struggeling with Conbee2 and deconz Integration. I got deCONZ Add-On working an can connect devices to it. Latest FW of Conbee2 26720700 is installed.
But i am not able to add the deconz integration. After selecting the device i get an error “Unknown error occurred”. Also the zigbee automation integration does not work. It says that USB cant be checked.