>The problem is that I don't want to re-add the tables,relations and views...and I tried "pack" and then I had to re-add the tables.Is there another solution?
It sound like your DBC is really corrupted. You can try

SET DELETE OFF
USE mydatabase.dbc
COPY to newdatabase.dbc

The other options would be to restore DBC from the most recent backup, if you have one.