Refraction Shader error

[Psi25]

this code from #179

vec4 sample_opaque(vec2 uv)
{
#ifdef PIXEL_SHADER
{
if(Settings.Transparency)
{
return texture(IN_OPAQUE_COLOR, uv);
}
}
#endif
return vec4(0);
}

is giving me error

any help would be appreciated

[pragma37]

See #238