The error 'godot unable to load .NET runtime' typically occurs when Godot Engine, which supports C# thanks to its integration with the .NET framework (specifically Mono), cannot find or initialize the required .NET runtime environment on the system. Causes can include:
Incorrect or Missing .NET SDK/Runtime: The most common cause is that the .NET SDK or runtime required by Godot is either not installed or an incorrect version is installed.
Wrong Configuration: The build configurations might be set incorrectly, pointing to a non-existent .NET runtime.
Corrupted Mono Build/Installation: The integrated Mono version within Godot could be corrupted or improperly installed.
Path Environment Variable: There might be an issue with the PATH environment variable not including the location of the .NET runtime.
Operating System Compatibility: The operating system might not be compatible with the version of Mono or .NET used by Godot.
Solution - Here's How To Resolve It
To resolve the 'godot unable to load .NET runtime' error, follow these steps:
Install the Correct .NET Version: Ensure that the correct version of the .NET SDK/runtime is installed on your machine, as specified by the Godot documentation for your version of the engine.
Check Godot's Mono Version: Verify that you have the corresponding Mono version that is compatible with your Godot version. You may need to download and install it from the Mono project website.
Verify Project Settings: In Godot, check the project settings under Project > Project Settings > Mono and ensure they're correctly configured for your setup.
Update Environment Variables: Make sure that the PATH environment variable includes the directory where the .NET runtime is installed.
Reinstall Godot/Mono: If all else fails, try reinstalling Godot with Mono support or repairing your Mono installation.
Check Compatibility: If you suspect an OS compatibility issue, verify whether your operating system is supported by the version of the .NET framework that Godot requires.
Consult Documentation/Community: Look through the official Godot documentation and community forums for any known issues similar to yours, as there might be specific instructions for your particular scenario.
By addressing the environmental and configuration issues described above, you should be able to resolve the 'godot unable to load .NET runtime' error and continue with your Godot project development using C#.