Dialog System Problem (same in Netexpress5.x and Visual Cobol 3.x)

Who has this Problem and have been able to find a solution?

Loading in DS is not a Problem, but when starting the program and loading the screenset i become the following window with a error Messages:

 

DSRUN error 28,0,0

Incorrect Dialog System vocabulary Information is stored in the screenset.

Make shure you have generated a vocabulary copybook for this screenset.

 

I works since many years and this is the first time and i don't find a solution.

I have exported the screenset and imported in a new screenset without Errors.

Who can help?