Problem about Odometry ,no output

Course Support ROS Basics In 5 Days (Python)
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2020-07-14 21-11-45 的屏幕截图
2020-07-14 21-11-45 的屏幕截图2678×1696 398 KB

I have let the robot running,and excute the odom_subscriber.launch ,but nothing be output.
why s that?

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Hi @weizhenyu1556
it looks like you have a typo. You subscribe to ‘/odem’ instead of ‘/odom’

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Thaks for your help.Its already done