Runtime Error While assigning Sales area to the sales document type through SPRO PAth

Dear Experts,

I am trying to assign sales document to a sales area following SPRO path but it is taking very long time and then throwing runtime error.Kindly go through the screenshot attache and please guide me how to cope up with this error.I also tried opening the debbugging screen but had no cle how to proceed.

Also let me know the reason behind the same

runtime-error.pngerror.png