File "/Users/pl/code/0.foursquare.web/.pantsenv/lib/python2.7/site-packages/pants/engine/round_engine.py", line 145, in _visit_goal
    context.build_graph)
  File "/Users/pl/code/0.foursquare.web/.pantsenv/lib/python2.7/site-packages/pants/backend/jvm/tasks/bootstrap_jvm_tools.py", line 111, in _alternate_target_roots
    dep_spec = jvm_tool.dep_spec(options)
  File "/Users/pl/code/0.foursquare.web/.pantsenv/lib/python2.7/site-packages/pants/backend/jvm/subsystems/jvm_tool_mixin.py", line 37, in dep_spec
    if dep_spec.startswith('['):

Exception message: 'list' object has no attribute 'startswith'