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I have the same error in my application. I am using CAN (Controller Area Network) interface with peak system. When I try to use only the roscore command with the peak connected on the USB port it give the same error: "You must specify a valid interface name." On the other hand, when I run roscore without connecting the peak system, it seems to be okay.

I saw this post https://github.com/ros/ros_comm/pull/211 but didn't help.

Any other ideas how it could be solved?

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