The version that you have installed and the version from where you imported the database must be the same.

If not, you have to upgrade the old database to the newer version, see [1] for it.

Does this fix your issue?

[1] https://www.mantisbt.org/docs/master-1.2.x/en/administration_guide.html#ADMIN.INSTALL.UPGRADE

Thanks alot!
yes as I know they are not in the same version.
I will follow Upgrading part in the documentation.

So probably also this error is because of different version.
APPLICATION ERROR 0000401
Database query failed. Error received from database was #1054: Unknown column 'p.inherit_global' in 'field list' for the query: SELECT DISTINCT p.id, ph.parent_id, p.name, p.inherit_global, ph.inherit_parent
FROM mantis_project_table p
LEFT JOIN mantis_project_hierarchy_table ph
ON ph.child_id = p.id
WHERE p.enabled = ?
ORDER BY p.name.

Regards,

So probably also this error is because of different version.
Yes