Crash

[cavour22710]

I've simply dowloaded the code and tried to run it but i don't understand what it should do, as soon as the two images appear and i press w,a,s,d or i,j,k,l the program closes itself with this error: C:....\2D-Grid-SLAM-master\ParticleFilter.py:130: RuntimeWarning: invalid value encountered in true_divide self.weights = field / np.sum(field) Traceback (most recent call last): File "test.py", line 123, in pf.Resampling(sensor_data) File "C:...\2D-Grid-SLAM-master\ParticleFilter.py", line 113, in Resampling re_id = np.random.choice(self.size, self.size, p=list(self.weights)) File "mtrand.pyx", line 1144, in mtrand.RandomState.choice ValueError: probabilities contain NaN