\ifnum\AMCbin@ndigits>#1\PackageError{automultiplechoice}{Too low AMC@NCB value (got #1 but needs \the\AMCbin@ndigits)}{Number of available digits is #1, but needs \the\AMCbin@ndigits}\fi%
Command \protect\explain\space can only be used inside\MessageBreak question like environments}{Something's gone wrong.\MessageBreak \space \space Try typing \space <return>\space to proceed, ignoring \protect\explain.