Seaquel
SQL Server error code

SQL Server error 1930

SQL Server raises error 1930 at severity 16, which marks a problem with the query or data that you can correct.

Cannot convert a nonclustered index to a clustered index because a foreign key constraint references the index. Remove the foreign key constraint and then retry the operation.
Msg1930
Severity16
Group1000–1999

Source: Database Engine events and errors