Jenkins Error "Not readable Data" after Migration


during the migration of Jenkins from V 2.89 to V 2.201 I jenkins always tells me,

that there is “Old not readable Data”

“hudson.model.FreeStyleBuild /// Job 12521515 //// CannotResolveClassException: hudson.model.ParametersDefinitionProperty$1”

I found a solution that says it´s fixable by pressing the “Upgrade” Button below it.

Unfortunately there appears no Upgrade-Button. Instead the button “Delete not readable data” appears.

When pressing it. It´s not possible to execute deploy jobs anymore.

Does anyone know how to fix this problem?

Grateful for every help!

Best regards