# Unable to try the demo

**URL:** <https://get-help.theconstruct.ai/t/unable-to-try-the-demo/6081>\
**Category:** ROS Navigation In 5 Days\
**Created:** [November 4, 2020, 10:16am UTC](https://get-help.theconstruct.ai/t/unable-to-try-the-demo/6081 "2020-11-04T10:16:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![LauYieHang](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/l/7993a0/32.png) [@LauYieHang](https://get-help.theconstruct.ai/u/LauYieHang)\
**Post date:** [November 4, 2020, 10:16am UTC](https://get-help.theconstruct.ai/t/unable-to-try-the-demo/6081/1 "2020-11-04T10:16:10Z")

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When I insert “roslaunch bb\_8\_teleop keyboard\_teleop.launch” in cell 1  
I receive this error  
[keyboard\_teleop.launch] is neither a launch file in package [bb\_8\_teleop] nor is [bb\_8\_teleop] a launch file name  
The traceback for the exception was written to the log file

I can’t solve this error

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**Author:** ![albertoezquerro](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/albertoezquerro/32/7031_2.png) [@albertoezquerro](https://get-help.theconstruct.ai/u/albertoezquerro)\
**Post date:** [November 9, 2020, 9:14am UTC](https://get-help.theconstruct.ai/t/unable-to-try-the-demo/6081/2 "2020-11-09T09:14:12Z")

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Hello @LauYieHang,

What course is this error from? I don’t think it’s related to the Navigation course. Could you please specify which course are you getting this error from?

Best,