RPG ParserScheduler error

I have been using RDP 8.5.1 on v7r1 without any issues for months. I am
a light user as I don't do a lot of heavy intensive coding. Yesterday I
opened up the outline on an RPGLE source, and the program immediately
became unstable, to the point of eventually crashing. Now I get the
following message every time I attempt to make a change to the source:



An internal error occurred during: "RPG ParserScheduler for
P4205.RPGLE".

com/ibm/etools/iseries/rpgle/RpgleFactory.createStatement()Lcom/ibm/etoo
ls/iseries/rpgle/Statement;



I have attempted to relaunch the workbench with the -clean option, but I
am still getting the error.



I attempted to search the archives, but they appear to be unavailable at
the moment.



Anyone have any insight on this error?



TIA,



Bob Cagle

IT Manager

Lynk, Inc.