API Error:Error running automation call <tt>diag-host</tt> (exit code 1) After upgrade from 1.6.0 to 2.0.0p6

Hello, i would like to discuss problem after upgrade from version 1.6.0p?? to 2.0.0p6.
Host pings look good, but all other services stucked at date of upgrade.

when i try to go to Host services that looks like this (is unable to change settings of services):
Error running automation call try-inventory (exit code 1)

when i try to go to diagnostics test, that all test ended with following error:

i tried to update one of old agents but behaviour is the same.

actually i dont have idea how to solve it. i will be glad for any help
thanks

Best Regards
Jan

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