Greetings @akbarsanjani

There is no error, week 8 of cryptoacademy, started from Oct 24 to 30, and before that period (7days before) and even days after until Oct 29, you had not turned on any Steem on your account, so, it is not an error, you did not perform Power Up in that period.

Make sure you are consistent in your power-ups, in order to get the point corresponding to the #club505050 initiative.

Steemit Cryptography Professor.
@lenonmc21