Why can not open the nobook，even in the free course？

[hezhenjiang]

why can not open the notebook，even in the free course？
I can not see anything in the notebook tag.but the ide , simulation and the terminal is ok

[bayodesegun]

Please let us know which course you were trying to open, and attach a screenshot or screencast of what is happening.

[hezhenjiang]

courses like C++ for Robotics, Linux for Robotics, python3 for Robotics

[hezhenjiang]

[hezhenjiang]