Getting a "expected primary-expression before 'float'"

Projects Programming
3

I'm trying to call a function in a header file using this line:

LTC2664_voltage_to_code(dac_voltage, float min_output, float max_output);

and I have no idea what a "primary-expression" is, or what it is reffering to. any ideas?

Thanks,

Justin

void loop()
{
  metervoltage = analogRead(meterpin);
  doublemetervoltage = 2 * metervoltage;
  digitalcoeff = (5 / 1023);
  flowrate = 0.00488759 * doublemetervoltage; // 0.00488759=digitalcoeff;
dac_voltage = flowrate;
LTC2664_voltage_to_code(dac_voltage, float min_output, float max_output);
LTC2664_write(LTC2664_CS, LTC2664_CMD_WRITE_ALL_UPDATE_ALL, 0, dac_voltage);

expected primary-expression before 'float'