How do I fix this run-time() error?

I've been getting this runtime error notification, and I'm not sure how to fix it in my code. I think everything seems right, unless this is something to do with my List procedure. Thanks!

Here is my components page as well

Perhaps because your Block sockets are empty here. :cry:

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Just off of the left of the runtime error in your screenshot, you can see that there is a select list item block with empty sockets. You may want to fill in those sockets.