If you browse the error on google you can find things like that:
It looks like you can use that tool only, if you have a "non-edited" database. If the tool is trying to delete something from the DB-table that does not have a primary key, it will prompt and error.
Steps to check:
- finally move your error window down, to check what kind of table is modified (_refXYZ)
- open the database in MSSQL studio, right click the table that is used and go to "Design"
- check for primary key (a key symbol)
- if you do not have it, maybe download a clean database
- create a backup of your current shard DB and copy the backup file somewhere else to be sure
- rename the downloaded database file to something else that what you are using
- restore the backup and use a different shard DB name (to add it together with the shard you are using)
- open the design of the same table in the new DB and check for primary key
Certain ppl do not take care about things like that and remove the primary key values from their DB, causing funny issues afterwards.
Better keep the DB structure as it is!