[Koha] upgraded from koha 3.0 to 3.2 but unable to run

[Yatheesh Y]

i am  getting following errors after upgraded from koha 3.0 to 3.2

Access denied for user 'kohaadmin'@'localhost' to database 'koha' at
/usr/share/koha/lib/C4/Context.pm line 692.
Compilation failed in require at /usr/share/koha/lib/C4/Auth.pm line 33.
BEGIN failed--compilation aborted at /usr/share/koha/lib/C4/Auth.pm line 33.
Compilation failed in require at
/usr/share/koha/opac/cgi-bin/opac/opac-main.pl line 22.
BEGIN failed--compilation aborted at
/usr/share/koha/opac/cgi-bin/opac/opac-main.pl line 22.
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