This happened because more than one guild member tried completing the same task in a short period of time so basically 2 messages get sent when this happens:
One will have the correct rewards
The other will have the error message
I checked your account logs and found you received all the Guild Task rewards successfully for the past week so don’t worry!
In future if you have an issue with missing rewards please send a support ticket as it will help us get back to you more quickly:
I had two error messages ‘Guild Task - No Reward’ this week.
And the other message doesn’t have the correct rewards: some gold keys were missing (it should have been 515 gold keys in the sum after all guild tasks are finished, not 485, right?).
Hi all, if you are missing Guild Task rewards or experiencing an issue and please create a bug report or contact support
This issue is generally caused when more than one member contributes to the Guild Task at the same time
There were unfortunately more issues experienced over weekly reset due to some server problems which are now resolved