Originally Posted by
bobbyrae
There are a couple of requirements for expanding.
1 you must have the required number of neighbours AND
2 you must have the required amount of coins.
you met the first requirement, which is the number of neighbours. Now you have to meet the coin requirement. The expansion did not disappear. It's the next available expansion size that is listed in your expansion tab.
There is also the option to expand using gems. Gem expansions, unlike coin expansions, avoid the neighbour requirement. Once you have the required amount of gems you are allowed to expand using those gems.