Check_mk Discovery UNKN-check failed after 1.6.0p30 installed

Troubleshooting
8

Hi Norm

This is the debug I get:
Check_mk version 1.2.6p12
Connecting via TCP to 10.10.1.111:6556.
OK - Agent version 1.6.0p30, execution time 1.6 sec|execution_time=1.559 user_time=0.280 system_time=0.040 children_user_time=0.000 children_system_time=0.000