"your application is not optimized for this system (macos)"

I’m using xojo 2019r11, and on a 10.14 macos, there is this message when I launch one of my app.
I’m compiling 64 bits
I have no certificate (so I also have a message “this app is made by an unknown developper” but I know where it comes from)

why is my app “not optimized” ?

Please double check.
And also check any helper tools run in background, too.

well you’re right. I was sure it was 64 bits because I though I did it but it wasn’t ! thanks.
and thanks to xojo going to 64 bits was a 5 mins job…