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LTC3889_PMbus Library_error

Hi,

I am doing coding for LTC3899 in arduino IDE for arduino mega2560. I  took pmbus library from analog website. But when I am calling function of setVoutMin from pmbus library it is showing error of undefined reference while for other function which I have used setVoutMax it is not showing such error. Please let me know which function I need to use to set minimum output voltage for LTC3889? or some other way to rectify this? Thanks