Shader error in 'StandardStochastic': maximum ps_4_0 sampler register index (16) exceeded at /Program Files/Unity5.6.6f2/Editor/Data/CGIncludes/AutoLight.cginc(45) (on d3d11)
Compiling Fragment program with DIRECTIONAL SHADOWS_SCREEN _NORMALMAP _METALLICGLOSSMAP _DETAIL_MULX2 _PARALLAXMAP _STOCHASTIC_ALBEDO _STOCHASTIC_NORMAL _STOCHASTIC_HEIGHT _STOCHASTIC_OCCLUSION _STOCHASTIC_SPECMETAL _STOCHASTIC_DETAILNORMAL
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING UNITY_ENABLE_DETAIL_NORMALMAP SHADER_API_DESKTOP UNITY_LIGHT_PROBE_PROXY_VOLUME
Shader error in 'StandardStochastic': maximum ps_4_0 sampler register index (16) exceeded at /Program Files/Unity5.6.6f2/Editor/Data/CGIncludes/AutoLight.cginc(45) (on d3d11)
Compiling Fragment program with DIRECTIONAL SHADOWS_SCREEN _NORMALMAP _METALLICGLOSSMAP _DETAIL_MULX2 _PARALLAXMAP _STOCHASTIC_ALBEDO _STOCHASTIC_NORMAL _STOCHASTIC_HEIGHT _STOCHASTIC_OCCLUSION _STOCHASTIC_SPECMETAL _STOCHASTIC_DETAILNORMAL Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING UNITY_ENABLE_DETAIL_NORMALMAP SHADER_API_DESKTOP UNITY_LIGHT_PROBE_PROXY_VOLUME
Any clues? Many thanks