Although it seems to be this is one of the most basic things one might need to do, when I try to use a passed parameter in an HTML view to set a new variable, it says the the parameter is no declared.

 

Am I doing something obviously wrong?  If I want to declare a variable, I use "set variable", right? Then if I click on the parameter under "variables" in the script builder window that pops up, it says it's not declared.

 

Please, I need help on this asap.