dbo.SHIPDWGShellExpSystem table is not created.
New tables were added to handle the shell expansion system. Specifically, the SHIPDWGShellExpSystem table was added. The migration of a V5 database to V6 added these tables to the database.
Version migration did not get accomplished properly.
You cannot create a Shell Expansion system (mesh).
What You Should Do
Perform the V5 to V6 migration procedure. In the event that the entire version migration is not necessary, the script that creates the table can be run individually.
Run Query Analyzer.
Load the SQL script (ShipDrawings\Server\Schema\SQL\VersionMigration\V5toV6\ODBShellExpSystem.sql), and execute it.