Xcode 10

I think I shot myself in the foot:
I updated my MacBook Air to Mojave and my iPhone SE to iOS 12 a while ago.
Everything was working fine.
Now I wanted to work on a Xojo iOS project again and can=B4t get it to work.

I already downgraded Xcode 10 to 9.4.1 but when I want to run my project Xojo reports:

"Linking Executable
ld: entry point (start) undefined.  Usually in crt1.o for architecture x86_64"

And Xcode says:
"This iPhone SE (Model A1662, A1723, A1724) is running iOS 12.0.1 (16A404), which may not be supported by this version of Xcode"

Soooo, what are my options=3F
Is there a new Xojo version coming soon that works with Xcode 10=3F

Greetings from Germany,
Bernd Fr=F6hlich