alt_ic_isr_register error

can anyone tell me why I am getting this error:invalid conversion from 'void (*)(filterVars*)' to 'alt_isr_func {aka void (*)(void*)}' [-fpermissive] AirRegulator.cc /SystemCode line 52 C/C++ Problem

It is saying I am doing something wrong with my 4th input. I am trying to enter &ADCdata which is a structure I created and am trying to fill with data read from an ADC on the max 10.

This HAL API command is the only error in my program.