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

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

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

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

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