XCode 11.4 image uses macOS version that is unsupported by that version of XCode

[native-api]

@dixlorenz

It’s calculating millions of numbers and only a handful are off

Tracing time, I guess… then diff the output

Operation not permitted - /Users/travis/Library/Application Support/CallHistoryTransactions

It’s debugging time, I guess. Debugging is always done via the same procedure: Identify the exact place in the code where the problem manifests itself Examine the program’s state at that moment to find out which of the involved values is wrong Trace the wrong value back to its origin You can use debug printing or request debug mode for your project.