Sorry for the late response. So I did a new scene and put on a "test" shader for the miarmy agents. I named the Shader Test_MAT and the shading group is TestSG. I get this error when rendering the arnold standin -
// Error: [ass] line 2318: woman_hair04_locoGeoShape14.shader: unresolved reference to 'TestSG' //
// Error: [ass] line 2232: woman_Cloth06up_locoGeoShape14.shader: unresolved reference to 'TestSG' //
// Error: [ass] line 1329: man_Shoes_casualGeoShape8.shader: unresolved reference to 'TestSG' //
// Error: [ass] line 1243: man_body03_casualGeoShape7.shader: unresolved reference to 'TestSG' //
// Error: [ass] line 2103: man_Cloth02_casualGeoShape13.shader: unresolved reference to 'TestSG' //
I opened the aishader.ass that was produced and this is what it says -
### exported: Tue Oct 30 10:12:27 2018
### from: Arnold 5.2.0.1 [b9c11b0c] linux clang-5.0.0 oiio-1.7.17 osl-1.9.9 vdb-4.0.0 clm-1.0.3.513 rlm-12.4.2 2018/09/10 14:50:49
### host app: MtoA 3.1.0.1 d2443247 (master) Maya 2018
### user: julian-f
### render_layer: defaultRenderLayer
### scene: /jobs/mpc3DAssets/miarmy/crowd010/maya/scenes/lighting/julian-f/crowd010_lighting_Test_v2.ma
standard_surface
{
name Test_MAT
}
standard_surface
{
name chromeBall_MAT
base 1
specular_color chrome_complex_fresnel
specular_roughness 0
specular_anisotropy 0.5
metalness 1
coat_IOR 1
}
Miarmy version 6.2.15
Let me know if this helps