Change parameter with value conditions in a list

Dear alls!!

I read million times and I am fighting with dynamo but he always wins :(.
I am new with dynamo but we need to change value of a shared parameter “Suma/resta en adicional” but this value have to change with a contidion on a list. The warning said “hace referencia a un no puntero” :frowning:. Help`me please!!!
Sorry for mi english.

Try first to wire the All Elements in Active View node to your Boolean filter instead of the parameter values. See also this post about conditional filtering.

Sooooo Thank you!!! Really help me!! Thank very much!! Now, we have to continue…

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