I tried the ./run-tests.sh command to launch two horizon dashboards on two separate ports but wasn't able to get the second one up and running. I also tried the default port for the second one and that didn't help either. Below is the error message that I get-

SassEvaluationError at /auth/login/
Error evaluating expression:
    $members-list-padding

on line 1355 of dashboard/scss/horizon.scss

Traceback:
  File "/usr/local/lib/python2.7/dist-packages/scss/calculator.py", line 141, in evaluate_expression
    return ast.evaluate(self, divide=divide)
  File "/usr/local/lib/python2.7/dist-packages/scss/ast.py", line 346, in evaluate
    raise SyntaxError("Undefined variable: '%s'." % self.name)
SyntaxError: Undefined variable: '$members-list-padding'.