Thanks for your question. However, please ask your question on http://answers.ros.org following our support guidelines: http://wiki.ros.org/Support
ROS Discourse is for news and general interest discussions. ROS Answers provides a forum which can be filtered by tags to make sure the relevant people are included and not overload everyone.
Also please ready through the guidelines for asking a good question. In particular please provide enough background to reproduce your problem, including your platform, steps taken prior to the error, as well as links to any instructions you’re following.