Can't launch my project build: FilenameToLongPackageName failed to convert ''. The Result would be indistinguishable from using '' as the InFilename.

Development Programming & Scripting Blueprint
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6

Have you looked into the saved directory for logs regarding the reason for failure?

At the end of

FString FPackageName::FilenameToLongPackageName(const FString& InFilename){
if (!TryConvertFilenameToLongPackageName(InFilename, Result, &FailureReason))
	{
/* contents of function*/
UE_LOG(LogPackageName, Fatal, TEXT("%s"), *FailureReason);
	}
	return Result;
}

So the function seems to log the more precise reason for the failure to the log file.