What are you trying to do? What are the four files that you need? I think all the double quotes everywhere may be confusing things. You don’t need any in the file-path for mkgmap, nor in the path to the img files.

Not sure why you’re using an empty series-name either. You might as well just not use the --series-name option. And unless you specifically want to limit mkgmap to using 12 processors, just use --max-jobs instead. -enableassertions can be abbreviated to -ea