Might be: 1. this transaction's gold coin, you've received or received today has exceeded the maximum size 2. system time delay, you need to click on the collect button to get gold coins.
Uh-oh! Failure to collect! Might be: 1 Amoy gold this transaction, you have to collect or receive today has exceeded the maximum 2 system delay, you need to re-click the button to get Amoy gold collection.
may be: 1. transactions of the gold coin, you have already received or today has more than the upper limit for delay of 2. system, you need to click a button to get the gold coin.