I am doing content porting activity from UAT to SYS.
While running content importing to SYS a sql exception error occured.
Note: this error occured while importing categories and keywords.
If you look closely at the stack trace of your exception, you will see that the exception happens at the
SyncronizeContentWithSchema() method. This method happens during every import. If you import a Component, it will automatically be validated against the current Schema in the system. The import will fail if a Component is not in sync with schema (for example, missing some mandatory field values, has some extra fields, etc.).
To fix this, please analyze what are the changes on the Schema that are disabling your Component from being imported.