Unable to convert fiddler script into a VuGen Script. Getting "System.AccessViolationException"error


While converting a script (recorded in fiddler) into vugen script I am getting following error:

"System.AccessViolationException: Attempted to read or write protected memory.This is often an indication that other memory is corrupt."


I tried to resolve it by uninstalling and then reinstalling fiddler as well as LoadRunner. 

I am using Fiddler v5.0 and LoadRunner 12.55.

Can someone please help get it resolve?