Waqar, in order to get served appropriately give enough details that community members could pin point the issues rather than making assumptions.
so start with which version you were upgrading from?
which web server and server O/S you're using?
DB version/PHP version
and also which plug-ins you've got installed.
so start with which version you were upgrading from?
which web server and server O/S you're using?
DB version/PHP version
and also which plug-ins you've got installed.