Error while running the program

[Ramon]

Hello,

where do you have that error? Paste the relevant blocks where the error triggers.
(you are trying to select the first item from "something" that is not a list)

How to Read and Understand a Runtime Error Message

We get lots of posts with run time error messages that look like [image] How can we extract useful information from error messages like that? Here's how: [Sample error message annotated] The name of the block is in the error message, between "The operation" and "cannot". In this case, the operation is "select list item". To proceed further, we need to look at a sample of that type of block, to see what it wants as arguments (the stuff that goes into its sockets.) This sample was pulled…