Please help me to solve this problem

gistfile1.txt

## Thsi code is taken from SensorMPU925X.java (PS-Lab android client)
scienceLab = ScienceLabCommon.scienceLab;
        I2C i2c = scienceLab.i2c;// here i am trying to get i2c but it returns null
        try {
            if (i2c == null) throw new IOException("i2c not found"); // i add this line to check i2c is null or not
            sensorMPU925X = new MPU925x(i2c);
        } catch (IOException e) {
            Log.d("ic2", "onCreate: "+e);
            e.printStackTrace();
        }
        
 I need to pass i2c in the constructor MPU925x but i2c is null. For this, 
 I got a null pointer exception when touching the MPU925X sensor 
 from sensor list please help me how to fix this problem.
 
 stack trace
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void io.pslab.communication.peripherals.I2C.writeBulk(int, int[])' on a null object reference
        at io.pslab.communication.sensors.MPU925x.setGyroRange(MPU925x.java:80)
        at io.pslab.communication.sensors.MPU925x.<init>(MPU925x.java:43)
        at io.pslab.sensors.SensorMPU925X.onCreate(SensorMPU925X.java:103)
        at android.app.Activity.performCreate(Activity.java:6303)