Seaquel
SQL Server error code

SQL Server error 6278

SQL Server raises error 6278 at severity 16, which marks a problem with the query or data that you can correct.

ALTER ASSEMBLY failed because the IsFixedLen attribute of type '%s' would change in the updated assembly. Persisted types are not allowed to change IsFixedLen attribute.
Msg6278
Severity16
Group6000–6999

Source: Database Engine events and errors