using resx file in visual web part

hi
i have created visual web part in SharePoint 2013,

when i try to use resource key i get the following error message on compile : 

"The name 'InitializeControl' does not exist in the current context"

i found out that when i add the code - "<%$Resources:ResourseFileName,Admin%>" to the ascx MARKUP, the VisualWebPartFile.ascx.g.cs file becomes empty..... and i get this error message