Warning: String.ToNumber operation failed

This is my first graph and already I have problems…
The graph is meant to filter sheet numbers by a range
It worked yesterday but today I receive an error with the String.ToNumber node that it failed and I guess all the other warnings are depending on that error.
Somehow I cannot upload because I’m new, so here is a link to the files:

I would be very graceful for any help…

Can you post a screenshot with visible previews? From the link we cannot understand the issue.

The node is supposed to convert numbers formatted as string to integers or doubles. If you have other characters than digits, it doesn’t work:

1 Like

Thanks for the answer
You are right, in the list there was one sheet with some letters and after I deleted it it worked!!
Thank you very much!!!
I hope will be able to help others like this!!