having trouble compiling shader for vulkan with shaderc

Question

i am trying to create a shader for Vulkan using shaderc but when compiling the fragment shader i get the error: '' : unexpected token.

here is my fragment shader:

#version 450 core

layout(location = 0) out vec4 color;

layout(push_constant) uniform Material
{
    vec4 u_Color;
} u_MaterialUniforms;


void main()
{
    color = u_MaterialUniforms.u_Color;
}

and here is the code for compiling it:

shaderc::Compiler compiler;
shaderc::CompileOptions options;
options.SetTargetEnvironment(shaderc_target_env_vulkan, shaderc_env_version_vulkan_1_2);
const bool optimize = true;
if (optimize) {
  options.SetOptimizationLevel(shaderc_optimization_level_performance);
}
shaderc::SpvCompilationResult module = compiler.CompileGlslToSpv(source, shaderc_glsl_fragment_shader, FilePath.c_str(), options);
if (module.GetCompilationStatus() != shaderc_compilation_status_success)
{
  AE_ASSERT(false, module.GetErrorMessage());
}

The vertex shader works and compiles. I tried simplifying the fragment shader so it uses a static color but that did not work and gave the same error. I am not sure where to start trouble shooting to find the bug.