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

[kcash]

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!

[kcash]

Here is my components page as well

[SteveJG]

Perhaps because your Block sockets are empty here.

[nishyanthkumar]

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.