+entityForName: could not locate an NSManagedObjectModel for entity name

[newdesicoder]

I have a window based applicaiton with tab bar and navigation bar integrated into it. On the navigation bar have a custom button whihc opens a table view.

On clicking on the cell of the table I want to open a new table view controller. But as soon as I click on the cell of first table I get an exception that

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'AddForm''

I have checked that AddForm is in right place.

I have tried all the solutions given above and on other thread, but still stuck. I hope someone can help me.

The flow is something like this

ListButton (on click opens a list view) -> a table view opens -> (on click of a cell should open a new table view Controller and fetch data from core data)

My root view controller code is in the second table view controller file.....is that what I am doing wrong>???? I am doing so because I dont need the core data before that....

Please help

Thanks in advance