'ModelData.Create(Provider, string, UnixTime?, string)': not all code paths return a value

Error Details:

You might encounter this error when you build your project.

Build Error: [16:45:38] Assets\Glitch9\AIDevKit\Core\Runtime\ScriptableObjects\ModelData.cs(152,33): error CS0161: 'ModelData.Create(Provider, string, UnixTime?, string)': not all code paths return a value

Solution:

Find ModelData.cs in the Unity Editor and add one line like in the following screenshot.