I am porting my C2 plugins to C3. It went well with all of them except one. I can't install it in C3, the only info I receive is "Failed to install the addon.".
Could you Ashley explain or list the possible reasons for it? This is not very informative info so I'm not sure what to fix.
Is there anything in the browser console? If not file a bug on the tracker and I'll try to make sure there's a special error message for that case.
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I'll send a c3addon to support[at]scirra.com in a minute.