Hi,
I guess your intialization got corrupted. Check your init infopackage under scheduler menu. I suggest you to re-initialize your init infopackage. If it doesn't allow u to run init infopackage, u need to debug the dump and get the request technical name and find it in RSSDLINIT table and delete from it.
After that, you need to do my first suggestion.
REgards,
Suman