After adding any new Stored Procedure in EDMX file.

I am getting two below errors.  After adding any new Stored Procedure in EDMX file - getting reference or namespace not found error?

1. The type or namespace name 'ObjectResult' could not be found (are you missing a using directive or an assembly reference?)

2. The type or namespace name 'Object' could not be found (are you missing a using directive or an assembly reference?)