I only recently installed Xcode 10 (yes, I know), and since then, new Swift code I write will compile but not run. It appears to be a "trust" issue.
Exception Type: EXC_CRASH (Code Signature Invalid)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: Namespace CODESIGNING, Code 0x1
Bobs-MBP:$ codesign -v -vvv /Users/bobsmith/programming/cocoa/test20/build/Debug/test20.app
/Users/bobsmith/programming/cocoa/test20/build/Debug/test20.app: CSSMERR_TP_NOT_TRUSTED
In architecture: x86_64
I looked at my certificate, and saw that it wasn't trusted. Changing it to "Always Trust" failed to correct the problem.
What should I do? Thanks for taking the time to read this.