Can anybody help me?

Can someone explain to me how to fix these errors:

"[115] Materials have missing Bitmaptexture nodes for one of the texture map slots (Diffuse, Roughness, Normal, Metalness) (2)

[117] Materials contain texture maps other than: Bitmaptexture, VRayNormalMap, VRayDirt, Falloff (2)"

Any information will be appreciated

Thanks a lot