Boozer intentionally built the wallet so that you cannot solo mine. Right now, the closest thing you're going to get to solo mining is literally on my mining pool (BlockEater), because I am literally the only person mining on it currently. You are more than welcome to join me until others come if you want. No login required, just follow the instructions for setting up your miner and you're all set.

If you are deadset on only solo mining coins, you will have to build your own private pool or you will have to find another coin unfortunately.