Error running mach:

    ['mochitest', '--headless', 'devtools/client/debugger/new']

The error occurred in code that was called by the mach command. This is either
a bug in the called code itself or in the way that mach is calling it.

You should consider filing a bug for this issue.

If filing a bug, please include the full output of mach, including this error
message.

The details of the failure are as follows:

ErrorMessage: Symlink target path does not exist: /Users/jlaster/src/moz/debugger.html/firefox/devtools/client/debugger/new/test/mochitest/examples/react/build/main.js

  File "/Users/jlaster/src/moz/debugger.html/firefox/testing/mochitest/mach_commands.py", line 370, in run_mochitest_general
    driver.install_tests(tests)
  File "/Users/jlaster/src/moz/debugger.html/firefox/python/mozbuild/mozbuild/controller/building.py", line 1374, in install_tests
    '_tests', test_objs)
  File "/Users/jlaster/src/moz/debugger.html/firefox/python/mozbuild/mozbuild/testing.py", line 266, in install_test_files
    remove_unaccounted=False)
  File "/Users/jlaster/src/moz/debugger.html/firefox/python/mozbuild/mozpack/copier.py", line 430, in copy
    copy_results.append((destfile, f.copy(destfile, skip_if_older)))
  File "/Users/jlaster/src/moz/debugger.html/firefox/python/mozbuild/mozpack/files.py", line 340, in copy
    raise ErrorMessage('Symlink target path does not exist: %s' % self.path)