Something weird have happened to me. I upgraded my town hall to five and I unlocked a cannon a tower a twenty five walls and a mortar and a bunker as well. The i builded the cannon and the mortar but when I go to build the tower it say I need hall six but previously build the mortar it was available. Shall I choose fist to build the tower and then the mortar to build booths or is that we choose to build one of them? Or is a bug??? So weird!!! Than you.