Fix minor typo in exception message
Fix minor typo in exception message

"occured" -> "occurred"
phusion/passenger,clemensg/passenger,clemensg/passenger,phusion/passenger,clemensg/passenger,phusion/passenger,clemensg/passenger,clemensg/passenger,clemensg/passenger,phusion/passenger,clemensg/passenger,clemensg/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger