This error means the shader is using more than 16 samplers. While shaders can support more textures (DX11 supports 128), it has a much lower limit to the number of samplers. To get around this, we can re-use samplers from other textures or use inline sampler states. Note this requires using the DX11-style syntax where samplers are separated from textures (e.g. Texture2D and SamplerState, rather than sampler2D). Can find more information on the SL-SamplerStates docs page. In Shader Graph, can use Sampler State node to achieve this, which would be connected to the sampler port on the Sample Texture 2D node.