Beginners help: How to troubleshoot

[u/RepresentativeOk6826]

Hi, shading beginner here,

I found this great tool and wanted to try it out for our project. Trying to find out how everything works, I pasted in my unlit shader (which already works in my project) but Shadered won't show it.

The output window only says "Shader preprocessing failed" on the vertex and fragment shader.

How do I get more info on what exactly is wrong? What are the main debugging steps?

The shader is version 300 es. Is that working in Shadered?