I have created account via WHM but when i login to Cpanel it shows "Serious problem while fetching quota data" in place of Space used. I have deleted the account and then created again but it shows error and i also cant upload any files because it says that no space left or something like this.

Any help would be appreciated!

Have you enabled quotas support?

Actually i am on reseller.

I also noticed that accounts that are started with "m" showing such errors in cpanel .For example if i create account for domain msn.com it will show this error abd if i create account for domain like hotmail.com it will not show that error.I have also contacted support but no reply from them yet so i was thinking if i can solve it myself.