well, meph is in act 3 akara in 5, but i think i know wot u mean
in the configuration files, not sure which one, there is a place where the minimum health is specified, this means that if you are below the minimum health you will go heal, but if the minimum health is higher then ur total healt (ex: ur max healht is 600, minimum health is 700) you will get an error, just change the minimum health number in the config to be lower then r max health and u shud be ok