void value not ignored as it ought to be

If Paul had that in code tags you'd see that there is a couple of array indexes there that aren't showing up. Should look like:

 for(int i = 0; i < numberOfSensors; i++)
   { // Down here where it belongs!
     cs_sensor[i] = new CapacitiveSensor(capSenseSend,sensorPin[i]);
   }