Error: Could not convert variant of type (Null) into type (OleStr)

I get there error message when i try to map popup message. I included a screen capture of the popup message i'm trying to map, also included a screen capture of the ''Map Object'' of TC. When i click on ''Ok'', it generates the error mesage, TC version 9.31.889.7.  Before the update to v9.31 i had mapped this popup and now does not work. Best regards, Fellow tester.