Spitfire App Error - "the JSON response was invalid" February 15, 2023 15:05 Updated Follow This error occurs when loading an old version of the Spitfire App that no longer connects to our servers. As a result, the installed version of the app will need to be uninstalled and redownloaded from here. Related articles "Error #1 Something went wrong" in Spitfire instrument Where to install Spitfire Libraries (Windows) How do I Uninstall a Spitfire Library? "Error #4 Something went wrong" in Spitfire instrument What is a Plugin?