An error occured while trying to access the service

i'm continually having issues with trying to convert my files from PDF to excel.  I keep on getting the error message "An error occured while trying to access the service" with no real explanation as to what is wrong.  I've tried several times on several different computers, logging on and off, changing users...same message everytime.  I have a time sensitive project to complete, and can't get it done if this conversion can't be done.  HELP!