No print or logs when debugging watchos

I wrote a watch-only App using Bluetooth wich is running on the watch. But no prints or logs appear on output. I only get: [S:1] Error received: Connection invalidated. [S:3] Error received: Connection invalidated. [S:4] Error received: Connection invalidated. [S:5] Error received: Connection invalidated. Message from debugger: killed Program ended with exit code: 9

In the launch log I find:

Showing Recent Messages Launch com.apple.Carousel Platform: watchOS Device Identifier: 00008310-001244D611D1A01E Operating System Version: 10.5 (21T576) Model: Apple Watch Series 9 (Watch7,1) Apple Watch von Draha is connected via network Installing com.apple.Carousel on Apple Watch von Draha Installing on Apple Watch von Draha Successfully installed XPC/App Extension Debugging Setup XPC Debugging for: gwe.WatchBleTest.watchkitapp.WatchBleWidget Console logging policy: Synchronously obtain os_logs via libLogRedirect, and read stdio from File Descriptors Stop XPC Debugging for: gwe.WatchBleTest.watchkitapp.WatchBleWidget View debugging: disabled Insert view debugging dylib on launch: enabled Queue debugging: enabled Memory graph on resource exception: disabled Address sanitizer: disabled Thread sanitizer: disabled Using LLDBRPC. The LLDB framework is from /Applications/Xcode.app/Contents/SharedFrameworks Device support directory: /Users/gertelsholz/Library/Developer/Xcode/watchOS DeviceSupport/Watch7,1 10.5 (21T576)/Symbols Attached to process with pid 469

What could be the cause of the issue, and how to fix it? Thanks for your help!