iOS Question Appcrash after starting

Without any changes of my code, it is suddenly not possible to start my project again. The last working version was compiled over the hosted builder on december, the 31. I checked all certs, but no one expires, i have updated all of them at the end of the last year. The app compiles without any problem, but after starting, in debug and release, the app crashes without any logs. I tried to set the SetDebugAutoFlushLogs on true, but no logs.
I mentioned, that I had a similar problem in the past after updating the xcode-version of the hostedbuilder, because one library was incompatible. Is that possible? It's a bigger project with using some more libraries.

Thanks for any help....