Hii,
I want to simply find the number of Contacts linked with each account. So i use aggregate query for this. I want to debug Account name with number of contacts. But it shows "Field must be grouped or aggregated: Name" and i have already group it by accountid. 
My query is given below-

list<sobject> totalContactVsAccount=[select count(id) totalContact,accountid,account.name from contact where  accountid!=null group by accountid limit 10000];
        for(sobject obj:totalContactVsAccount){
            system.debug(obj);
        }