error when deploy to fly io

this is the log when deploy to fly io


Unfortunately that line only says there was an error, not what the error actually was.

I’d recommend trying fly logs - that should show the latest X lines of the log for the app. That will often reveal what went wrong e.g out of memory, file not found, module not loaded … etc (depending on your app/language/dependencies). Lots of variables. But some kind of error message should point you towards the fix.