As the error message states, your password needs to be strong enough. For security, Bittensor does not have a predefined set of rules (i.e. you need alphanumeric characters, special symbols, special length, etc.). Instead, Bittensor uses so-called "entropy bits". This defines how much variety does your password have. For example, '01111010010011' is long enough, but has only 2 entropy bits: that's how many bits you need to store its alphabet. However, a password that uses plenty of characters has more entropy.