java errors 37 and 3707

Hello,

I am a beginner with Java programming within Max.

The program below has only one method and does what expected, that is printing the incoming data in the Max window.

However any number coming into either inlet do also produces error messages like these:

com.cycling74.max.MaxRuntimeException
    at com.cycling74.max.MaxObject.bail(MaxObject.java:3707)
    at ecran_resistif1.inlet(ecran_resistif1.java:37)

What causes these error messages ?

Thank you in advance.

    public void inlet(int i) {
        if (getInlet() == 1) {
            pos_y = i;
            bail("pos_y = "+pos_y);
        } else {
             pos_x = i;
bail("pos_x = "+pos_x);
        }

    }