Before anything else, have you tried running from the command line
with the same command?
If you want a clean JENKINS_HOME, but want to maintain you jobs, you
can just copy the JENKINS_HOME\jobs directory to another location (or
even better, just backup JENKINS_HOME to somewhere else) and then
delete JENKINS_HOME and reinstall. You should be able to copy the jobs
back over to the new JENKINS_HOME.
slide
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