I am attacking the castle of my second account, I have there more than 1M but my troops didn't loot..

Gold can only be raided by 1 legion. That is the class legion of the raider class player. If you are not a raider then you cannot take gold. And if you are then you can only take it when attacking with the 'class' legion.

If the player you are attacking is a farmer then they will have a protection level on resources and gold. If the gold level is below that then you cannot take it. All players may also have a protection amount from their alliance research level.

Set the other account to Trader. Its best you're a Raider.. only class legion can loot gold. Increase research to get more gold. You also get more gold when you attack Traders rather than Farmers and other Raiders.