Error during compose


I've made a page that includes the gallery block add-on. ( It works great when I add the block manually.

But when I add the block with the compose feature it gives an error when I click "save". I can't select images either when trying to add an image. The error I see is this:
{"aID":"134","arHandle":"main content","cID":"169","error":false,"bID":"81"}

I've tried to search the web for the error and saw something about javascript that might be executed to soon but couldn't fine any in the code.

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hutman replied on at Permalink Reply
It appears that this block wasn't setup to support composer. It doesn't have a composer.php in the files.