I completely understand the developers frustration with the ongoing repetitive complaints in this thread. But this is a paid plugin, which could be simply patched to fix the typing error with the supplied blueprints.json. I myself am not a developer or programmer, that's why I happily pay others for their work. I only purchased this plugin to give some higher tier items for my servers players to grind towards. But even with the 'pipes' problem resolved a grenade launcher is the only thing available. I'm reluctant to mention any of these further issues thought, as it seems i need to understand the language they were written to get help.