Backend Cache Invalidation - Mailing list pgsql-hackers

Is anyone willing to tell me what this means:

NOTICE:  SIAssignBackendId: discarding tag 2147449930
Connection to database 'db_domain' failed.
FATAL 1:  Backend cache invalidation initialization failed


And how do I fix this:

NOTICE:  Index tbl_mail_archive_pkey: NUMBER OF INDEX' TUPLES (2238849) IS
NOT THE SAME AS HEAP' (2241252)

Thanks,

Tim Perdue
PHPBuilder.com / GotoCity.com / Geocrawler.com