Resolved. Notes at end of post.
This server was running on my home PC a week or so ago. I restarted today and got this error. I even backed up the folder, deleted it, reinstalled from Steam and restarted. Same error. The only thing I can think that I changed was a Java update to the latest java. Also tried 32 bit Java. Still get the same error.
Code
UPDATE: Got it working. Had my Java path statement incorrect. Switched to 32bit java jdk "bin" folder in path and it is now working.
Will RWDS run on a 64bit java jdk?