ERROR “swiftc failed with exit code 1” when converting to latest syntax

Question

I was trying to convert syntax of old Swift project to new one as per few suggestion on Stack Overflow I tried converting it through Edit > Convert > To latest Synta

Answer 1

Just had the same issue. For me it was because I had renamed some of the project directories. I had a ton of red files in my project navigator. To solve, follow these steps:

1. click on the directory in project navigator where many files show as red
2. Under "Identity and Type" in the File Inspector (on the right side), click Containing directory
3. Select the new directories
4. Rebuild - command shift K, command B