if you get error “vzquota : (error) quota file is corrupted”

Use below commands,

[root@server9 lock]# vzquota off 5000

vzquota : (error) quota file is corrupted

[root@server9 lock]# vzquota drop  5000

[root@server9 lock]# vzctl start 5000
Starting container …
Initializing quota …

Now wait for quota to get recreated