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This problem is most likely caused by an upgrade from v1Checkmk version 1.6 to v2version 2.x by old MKPs, which are incompatible with v2version 2.x.

1. Switch to your site  user

   Code Block
   language bash theme RDark
   root@linux~# su mysite

   .

2. Run cmk-update-config -v

   Code Block
   language bash theme RDark
   OMD[mysite]:~$ cmk-update-config -v

   
   

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