Thank you for contacting us.
The reason for your issue is that you have a custom field(s) based on a classification that no longer exists. We strongly recommend to upgrade your project to the latest Sitefinity version
. With this upgrade you won't be able to delete Classifications, that are being used.
However to manage your current situation, you will probably need to manually clean up your database.
- First backup your database;
- you should find a table called - sf_sitefinity_profile_<the name of the custom field>;
- Remove that table;
- Go through Administration -> Users -> Manage Profile types -> <choose your profile>;
- Remove all fields that are based on classifications;
Step 2 and 3 are not recommended, because it is good to clean your Database. However if you follow step 1, 3 and 4 it will be enough to fix your issue.
All the best,
the Telerik team
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