Error in Saving Lidar Point Cloud

[elwaaamr]

Hi... I am try to run the " 07-save-lidar-point-cloud.py ", but it gives me the following:

Python API Quickstart #7: Saving a point cloud from the Lidar sensor Traceback (most recent call last): File "./07-save-lidar-point-cloud.py", line 32, in s.save("lidar.pcd") File "/home/amr/Downloads/PythonAPI/lgsvl/utils.py", line 23, in new_f return f(*args, **kwargs) File "/home/amr/Downloads/PythonAPI/lgsvl/sensor.py", line 105, in save "path": path, File "/home/amr/Downloads/PythonAPI/lgsvl/remote.py", line 69, in command raise Exception(data["error"]) Exception: Object reference not set to an instance of an object

So, what is the problem?! and How to solve it?