If possible, could you please let me know you system configuration?
When you see the 3::0 error, at the time loading after effects? or at the time of applying the ContrastUp plugin to a footage?
Did you try to put the plugin file into "C:\Program Files\Adobe\Common\Plug-ins\7.0\MediaCore"?
Did you try it on Premiere Pro, if yes, did you get the same error message?
Thank you.
Best Regards
John