urgen change: Task list is not created

Hello experts!

I created Urgen change.

My error: No maintenance cycle is open for the current system

Text log

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General Note

28.03.2012 17:51:39 Дмитрий Владиславович Захаренков /

Task list created in SAP Change Manager

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Why is not number of Task List displayed in Task log? How to solve this problem?