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there are some error happen when I try to reschedule

4 mesi fa

Today , I bought lesson coupon of 10 times and then I settled first class time table,
soon I knew that I need to change time schedule, But when I try to change time table,
there are some error happen when I try to reschedule .
How to solve this software bug in system ?

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Inglese
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2:27 PM (GMT+09:00)
Membro dal: 13 aprile 2018