Unable to create custom consensus smart contract.

[vinaywebcom]

I have been trying to use validator smart contract to create a smart contract to add validators.
I want to mimic ethereum's deposit smart contract so that anyone can become a validator by depositing in smart contract.
I modified smart contract to make few addresses as validator by default. But every time I am starting the node I am getting "Unable to seal blocks Unauthorized"

In contract's constructor I called activate(0x6cee5c60DFfF2ADA3c75E6b6A69E55BCAdDF81AB);
I tried some other ways as well like modifying the initialAccounts & initialValidators array, but with no success.