Well you either made some bad changes to the java files or this is an rpk load order related issue lets hope it is not.
We assume this is java related:
Delete the error.log from your slrr root dir (it will be full of junk by now as it appends to this file every error it finds and does not clear it on startup or ever for that matter)
Run slrr if it crashes open the error.log and it will tell you what its problem is, but as it worked before I'm almost sure it will point you to the lines you edited.
