Yup... looks like it's the addin.xml...
The message that GooTool gives is a little vague, but does tell you it's a problem with the id

Looks like GooTool DEMANDS that you include at least one . in the id.

You should read this.... http://goofans.com/developers/addin-file-format/manifest-file

and I'll do something in WoG Editor to ensure you can't produce goomod's that GooTool won't accept.

Thanks for finding this out.

{EDIT}
Oh.. and I just looked at the level...
it's a nice idea, but I don't think it will work!

"THERE CAN BE ONLY ONE!"

I know what your problem is! you put the level name as the id when the id should be something like this example. com.website.author.mod/level name(don't put spaces when you put in the name of your mod/level)

oh yeah and one more thing. It seems 2 pipes do work in a level, but the second pipe won't have images.

and I discovered another thing. the first pipe doesn't work at all!

Well, the second pipe doesn't work, I changed it now it works its called Deadly Rise.

yep, i just posted a comment on that addin.