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Migration deployer fails with System error 13

LinqLOL

Basic Pleskian
I'm trying to migrate sites from one 11.5 server to a 12.0 server. But I'm getting an System error 13: Permission denied error with the deployer:

Code:
<?xml version="1.0" encoding="UTF-8"?>
<response>
    <errcode>1001</errcode>
    <errmsg>Runtime error in migration handler:
&lt;class 'migration_handler_restore.MigrationRestoreException'&gt; Unable to start deployer '/usr/local/psa/admin/bin/deployer --deploy-dump --verbose --session-path /usr/local/psa/PMM/rsessions/20151209154521947 --dump-index-file /usr/local/psa/PMM/rsessions/20151209154521947/dump/dump_index.xml': deployer: execve failed for /usr/local/psa/admin/sbin/deployer: Permission denied

System error 13: Permission denied

Traceback (most recent call last):
  File "/usr/local/psa/admin/share/migration-handler/migration_handler.py", line 2020, in main
    data_action_response, errcode_response, error_message = actions.get(sys.argv[1][2:])(parameters)
  File "/usr/local/psa/admin/share/migration-handler/migration_handler.py", line 1901, in migration_start
    return MigrationHandlerActionRunner(MigrationStartAction, None, migration_session_id).doActivity()
  File "/usr/local/psa/admin/share/migration-handler/migration_handler.py", line 108, in doActivity
    result = self.processor.doActivity()
  File "/usr/local/psa/admin/share/migration-handler/migration_handler.py", line 1088, in doActivity
    restore_service.restore()
  File "/usr/local/psa/admin/share/migration-handler/migration_handler_restore.py", line 613, in restore
    response_data_task_id, restore_task_id = self.__doRestore( ignore_conflicts = True )
  File "/usr/local/psa/admin/share/migration-handler/migration_handler_restore.py", line 524, in __doRestore
    response_data_task_id, restore_task_id = self.__invokeRestore(restore_task_description_object)
  File "/usr/local/psa/admin/share/migration-handler/migration_handler_restore.py", line 388, in __invokeRestore
    raise MigrationRestoreException(response.get_errmsg(), response_data_task_id)
MigrationRestoreException: Unable to start deployer '/usr/local/psa/admin/bin/deployer --deploy-dump --verbose --session-path /usr/local/psa/PMM/rsessions/20151209154521947 --dump-index-file /usr/local/psa/PMM/rsessions/20151209154521947/dump/dump_index.xml': deployer: execve failed for /usr/local/psa/admin/sbin/deployer: Permission denied

System error 13: Permission denied

</errmsg>
</response>
 
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