Trying to convert a project from C# to GDScript, and have a few errors that I can't figure out

[trim tiger]

For context, here is the project with the C# https://github.com/daniellimws/godot-procedural-landmass/blob/master/Scripts/TextureGenerator.cs

[barren pelican]

You'll probably get better help if you share what the errors are and the code causing them, rather than just linking an entire project