One possible cause is when an attempt has been made to access the record area, but it has not yet been allocated because a file is not yet in the OPEN state; see the HOSTFD directive for more details.
In a Windows environment, this results in the file mfdebug.log being generated in your current directory. However, if the application does not have write permissions to that directory, mfdebug.log is created in a product specific directory instead, under the directory specified by the LOCALAPPDATA environment variable; for example, %LOCALAPPDATA%\Micro Focus\<product name>\<product version>\logs\mfdebug.log.
SupportLine may request you supply this file when troubleshooting the error.