I got this error when I try to upload the plugin to my new 6.1.1 (upgraded from 5.2) evaluation version.
Could not find a handler capable of installing the add-on at jira-greenhopper-plugin-6.3.3.jar. Check that the file is a valid add-on.
Hey there, it sounds like corrupted jar file. Can you check whether the file is integer?
ecrnt-06:Downloads tcomasseto$ md5 jira-greenhopper-plugin-6.3.3.jar MD5 (jira-greenhopper-plugin-6.3.3.jar) = 7edbfd814e2f8b3f6540c5cb93659444
Cheers
http://onlinemd5.com/
I use the above tool, the result is 5055AE45FF38CA8CCD96FFEA71930077
I just downloaded the jar this morning from https://marketplace.atlassian.com/plugins/com.pyxis.greenhopper.jira
I downloaded again today, and it worked.
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