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The rear_wheel_link warning is due to that link being unactuated and free floating it cannot be rendered due to lack of information.
The warning about the path is because a planning path has not been sent yet. And when running SLAM gmapping doesn't publish the pose_array like amcl does.
The "Bad Gyro Calibration" is your problem. Can you cut and paste the entire error from the dashboard for that error, and edit your question to include it?