Why are we getting "An exception of class NilObjectException was not handled. The Application must shut down." When opening Casper Admin 9.73 in Mac OS X El Capitan? Casper Admin working fine from other versions of Mac OS.
And apparently to run Casper Admin 9.8 from El Capitan you need to have 9.8 JSS installed. So I will have to go back to one of my other computers still running Lion thru Mavericks with 9.73 Casper Admin to manage 9.73 JSS and clients until we move to JSS 9.8 and move all clients to 9.8. Not glad I updated to El Capitan on my laptop and MacPro at this point.
Just to add some confirmation, I can also get the Version mismatch error here running Casper Admin 9.81 on a 10.11 Mac trying to connect to our production 9.73 JSS. It does not work. I don't know how @rcarey912 is getting it to work, assuming it actually is, but it doesn't seem to work generally speaking.
Not that I'm surprised. I believe its always been this way. You need to have the same version of server and apps.