Cannot skip mission (unknown error occured)

MainMan B

Berserker
Feb 23, 2018
146
72
28
59
Denmark
I have tried skipping the Battle of Opis mission with my Roman Civ, but get an "Unknow errror occured when processing your request" message, when trying to do that. In fact, it's all skipable level 40 quests on all my (3) level 40 civs, I cannot skip. Sorry for this late edit.
 
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Can't skip Opis 2.jpg Here's the message I get, when trying to skip Battle of Opis.
 
When did you try this? If you don't remember can you try again and then let me know the timestamp?