Zwave install "failed to read network key"

i attempted to add a zwave stick with an already defined network key, but it seemed not to work because no devices including the stick were listed as nodes.

Now on restarts my home assistant service fails to load with the following log message:

2019-03-20 15:36:54 INFO (SyncWorker_10) [openzwave] Start Openzwave network.

Error: Driver.cpp:6772 - Failed to Read Network Key

how do I remove the zwave configuration since I included it from the GUI? or how do i remove the network key that seems to be the problem?