Command SwiftCompile failed with a nonzero exit code

The error message says there was an error compiling your code. The actual errors should appear in the issue navigator (shown in your screenshot) or the report navigator (Press Cmd-9 to open).

Your screenshot isn't showing any additional errors. If you choose Product > Clean Build Folder in Xcode and build the project, does the error go away? If not, do additional errors appear in the issue navigator?

Did you make any changes in your code recently before building the project? For anyone to provide additional help, you need to provide more information on what you were doing before you got the error.