Failed to delete a domain alias

[WebSurfer]

When I was trying to delete a domain alias through Plesk 7.5.1
and I get the following error :

ERROR


DomainAlias::delete() failed:


0: C:\Program Files\SWsoft\Plesk\admin\htdocs\domains\domain_ali
ases.php:45 psaerror(string "DomainAlias::delete() failed: ", string "domainmng::del_alias() failed: domainmng failed: Run-Time error: Execute mailmng --remove-alias "--domain-name=vip-forum.net" "--alias-name=www.123.net" "--alias-type=full" failed: Run-Time error: MEAOSM.Domain.RemoveDomain failed")

When I tryied to delete trough command line I've got the same.

C:\Program Files\SWSoft\Plesk\admin\bin>mailmng --remove-alias "--domain-name=ma
skankerman.gov.ir" "--alias-name=fat.ir" "--alias-type=full"
Run-Time error: MEAOSM.Domain.RemoveDomain failed

Do anyone know how to repair it ?