What means this message in the COBOL RTS terminating window:

The Micro Focus COBOL RTS has detected an RTS error number 240, and has coredumped the process into i:\\adm\\prog\\cblcore (starting Directory)

than a new error window:
Execution error: file 'associtn' error code: 240, pc=0, call=1, seg=0
240 Object reference not valid

'associtn' is only defined in the self generated program from microfocus for the datepicker:

class-control.                           
   Window is class "window"              
   CharacterArray is class "chararry"    
   OrderedCollection is class "ordrdcll" 
   Association is class "associtn"       
   Dictionary is class "dictinry"        
   CobolComp5 is class "comp5"           
   KeyBrd is class "keyboard"            
   MessageBox is class "msgbox"          
   EntryCallback is class "entrycll"     
   Color is class "color"                
   Mouse is class "mouse"                
   Font is class "font"                  
   DatePicker is class "datepick"        
   .                                     

I can start the program any times, since time a become this Errors.

the cblcore file is 174.796.056 Bytes big. What can i do with this file?
Thanks for help!