Can't view excel files in Browser / Unable to proess the request. / Wait a few minutes and try performing this operation again.

i have an error in excel file view in browser,

Unable to proess the request. / Wait a few minutes and try performing this operation again.

i have a farm with 1 Database Server, 1 SharePoint Server.

note: i have Alias for SQL Server in SharePoint Server

i try all of the solutions on the web to fix this problem but i can't.

PLZ Help!!!