Shader objects, strange error with vertex input bindings

[fknfilewalker]

When I use a Shader Object with a shader having the following inputs:

layout(location = 0) in vec2 aPos;
layout(location = 1) in vec2 aUV;
layout(location = 2) in vec4 aColor;

I get the following error when creating the Shader Object.

[mvk-error] VK_ERROR_INITIALIZATION_FAILED: Render pipeline compile failed (Error code 2):
Vertex attribute aPos(0) is missing from the vertex descriptor.
[mvk-error] VK_ERROR_INITIALIZATION_FAILED: Render pipeline compile failed (Error code 2):
Vertex attribute aPos(0) is missing from the vertex descriptor.
[mvk-error] VK_ERROR_INITIALIZATION_FAILED: Render pipeline compile failed (Error code 2):
Vertex attribute aPos(0) is missing from the vertex descriptor.

yes 3 times.

Code can be found in the following file.
https://github.com/fknfilewalker/evk/blob/main/src/imgui_backend.cpp
Target "imgui_rasterizer_triangle", though it requires a new llvm version e.g., from homebrew

[cdavis5e]

Based on this line, you appear to be using VK_EXT_vertex_input_dynamic_state, which we don't support. This extension is distinct from the VK_EXT_extended_dynamic_state extensions that we do support.

[fknfilewalker]

How do you set this for a shader object then?