1. For a specific Knowledge article with error, identify all picklist fields and values used in the article with error.
2. Attempt to create a new test article using the picklist values that are present in the Knowledge Article causing the error. If you don't see the picklist values as available when creating a new article, it would indicate the picklist value is not active or available for the assigned record type, or the picklist values are not a valid dependency.
If the picklist value is inactive, reactivate or replace that value to resolve this error. See also:
Review your picklist dependencies to see if the currently selected values are mapped properly.
If you're receiving the error in Lightning Experience, view the article in Salesforce Classic to see if it is locked by an approval process.
As per the General Chatter Allocations documentation, there is a hard coded system limit of 200 topics assigned to knowledge articles. This limit is aggregated across all article translations. So for example, if you Add Topics to Articles in an Experience Site the total number of topics may look to be under the limit, but each Topic is actually applied to all translations. If you have 21 topics assigned and 10 translated versions of the article you will exceed the limit of 200 topics assigned to the article (21 topics x 10 translations = 210 topics assigned).
To resolve, remove the required number of topics assigned to the article in question to maintain under the limit of 200. Admins can also identify the Topics currently assigned to an article using the API:
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