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there are some error happen when I try to reschedule

il y a 5 mois

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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Alex
FlagAnglaisIl y a 2 heures
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Pierre
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Anglais
Flag Corée du Sud
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Membre depuis: 14 avril 2018