Parameter of type Instance is not being found

Good morning people!

First I would like to inform you that I am using google translator.

I’m studying Dynamo and I’ve come across this problem that seems to be simple, but it’s forcing me to do several tests without success.
The routine is not recognizing the name of the instance parameter “ID_Elemento”.
What am I doing wrong?



you have to convert the ID to a string value to store it!