GLSL compilation failed: 0(31) : error C7537: OpenGL does not allow 'smooth' after a type specifier 0(31) : error C1322: invalid empty declaration type 0(112) : error C0000: syntax error, unexpected ')', expecting "::" at token ")" Is this a known problem, bug or incorrect usage? I imported a package from asset store and I see this. Can it be fixed by updating GLSL?