String2Enum node red

Hi, I am relatively new to vvvv, have spent a long time pondering over tutorials and help files and I want to get mre working. When I drag the mre node into my existing patch, the mre node is red. Inside the mre subpatch the String2Enum nodes are red. Am I doing something wrong? My current patch is using basic shapes and a renderer with a shader.

Many thanks!

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