it seems that today's server issue lead to some Alliance data not being properly saved.

If you should notice irregularities in your game, please don't hesitate to contact our support teamwe are happy to announce that we were able to identify the issue and solve it.

Lost progress should have been restored.

Thank you for your patience and sorry for the inconvenience.

Thanks !

I didn't find the right solution from the internet.

References:
http://forums.flareges.com/topic/319tential-issuelated-to-alliances/

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