The error “The configuration ‘X’ cannot be checked.” error occurs while checking the prerequisites of a GER configuration ‘X’. It may happen when the current instance of the Dynamics 365 for Operations application contains at least one application hotfix that has not reference to a related KB article. Finally, not passed the prerequisites check configuration cannot be downloaded from a repository due to the error “Cannot create a record in KB articles (ERKBArticleTable). The record already exists” occurs.