Invalid IntelliJ version number

Hello Aj Williams7.

Please, note that the Flutter software, such as the Flutter Doctor tool and the IntelliJIDEA Flutter plugin, is developed by the third-party Flutter company not related to JetBrains. I'd recommend you ask for help in the Flutter Community channels listed in their official documentation or in the Flutter issue tracker on GitHub. 

Installed the Intellij IDEA flutter plugin in Intellij IDEA IDE fixed the Invalid IntelliJ version number error message. Thanks

Aj Williams7, thank you for the update; I'm glad you fixed the problem. 

Please, feel free to contact us in case of any IDE-related questions.