System error of Course [email protected]

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The system failure below has been restored at April 5.
We sincerely apologize for the inconvenience this causes you.

Since March 20, the system failure that you get a system error has occurred in Course [email protected]
Now, we are working to fix it.
Please try the following procedure when the system error is shown until the failure is fixed.

 1) Go back to the previous window
 2) Repeat the same operation

We apologize for any inconvenience, and thank you for your patience.