Do i need to print and mail Alberta AT1 after i netfiled the complete return? It says to submit a paper version to Alberta Revenue. Cannot print AT1 RSI alone.

I read earlier posts here and it says that both federal and Alberta return are filed electronically at once. But why would it say in software that Alberta return needs to be mailed in in paper version? I cannot print AT1 RSI without "do not file".

Do i or do i not need to print Alberta AT1 RSI and mail in?