Error : Schema is not valid. The relationship was not loaded on the type.

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MVC

entity-framework

I have using Database first approach. when i change the column name in database and 'update model from database' in the edmx file.
I got the error while build the application as

'

Schema specified is not valid. Errors:
The relationship 'projectname.FK_jobitem_employee' was not loaded because the type 'projectname.job_item' is not available.
The following information may be useful in resolving the previous error:
The required property 'job_trans_num' does not exist on the type 'projectname.job_item'.

'
If anyone have idea please reply..