How to Fix V2015.12 C3/C4 Xentry Activation Fail

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When activate Xentry, Star date and Finish date should be 2012-01-01 and 2020-01-01.
While I activate it, it shows dates as picture

After I input a new Startkey and click "Save", it shows


Solution:
1.Set laptop's date as current date.
2.Delete