I am having some problems with a code

[antoniojoao1]

Hey there guys, I am new with power fx and I am having a problem, so there is this checklist, I need to make some adjustments. It's a vehicle checklist, and I need to add a function that prevents users to open a new checklist without closing a previous checklist, so I developed this code:
If(
IsBlank(
LookUp(
Responsavel_DataCard2,
DataCardKey5 = DataCardValue30 And ChecklistStatus = "Open"
)
),
Notify("A new checklist can be open."),
Notify("You have an open checklist. Finalize it before opening a new one.")
)

but power apps keep saying there is an error on the code, and I can't find, any help would be welcomed.

[anderson-joyle]

Can you please share what the error message says?
Also, I suggest you ask this question at https://powerusers.microsoft.com/t5/Building-Power-Apps/bd-p/PowerAppsForum1.

[antoniojoao1]

Hey, Anderson. When I apply the code, I get a lot of errors, even in itens there are directed affected by the code. I get "Unexpected
Characters", I get "Invalid Name". The "unexpected characters" erros says that I should change an at sign to a colon. The "invalid name" says that some item does not exist anymore, but when I remove the code, all of the errors disappears.