Change parameter with value conditions in a list

[carlos.pita]

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” . Help`me please!!!
Sorry for mi english.

[Yna_Db]

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.

[carlos.pita]

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