@Darniela Did you try going here, then right-clicking "save as" ChainCommand.js? Sometimes plugins are sensitive to name changes or stuff. You could also try running this plugin in a new project and seeing if you can launch it there, if you can it might be a compatibility issue with something else you have. If it still doesn't work, wost-case zip up your project files, upload them to dropbox or something, then PM me the link. I'll try to to investigate.