Gmail is the most popular and the easiest communication solution available for the users around the globe but this site also has a lot of errors and troubles that it encounters on a daily basis. Such as this sync error given above is one such common error, in order to get this error fixed open the application click menu settings appearing on the left, click your account see to it that the box next to sync Gmail is tick marked. If still the error doesn’t sign off then ask the Gmail expert.