Hello,
I've exported my animation to JSON, but I've received this bunch of errors x_x Don't know what to do.. Every image is fine on the project and are on the folders.
Image for attachment [] not found:
The editor can't find your images, so when you export it gives you a warning that it didn't know about the images. See here for how the editor looks for your images:
http://esotericsoftware.com/spine-images#Image-file-lookup
You should set your skeleton's images path correctly and make sure those images can be found.