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Whirlpool is used for hashing password. You can still use the register and login systems without having Whirlpool. just replace the WP_Hash() function with format(). But its better to use Whirlpool so that players playing in your server will trust you fully for showing loyalty. By the way, if you use one click mod installer in volt to install plugins, it must not show error. If it shows, you should better contact their support desk for more help.