Blueprint Shader Error

I am trying to make a post process shader that give an “oil painting” vibe. Here is my blueprint.

I get the following error:
[SM5] (Node Multiply) Arithmetic between types float4 and float3 are undefined
Any help appreciated, thanks.

Try changing your vector3 parameter (the yellow node with the white square in it) to a vector4 or color parameter so that it has 4 values instead of 3

Add componentmask(rgb) after scene texture node.