When I run azure_kinect_mkv_reader.py to get the depth map in mkv, the error Invalid k4a_capture_t appears

**This is the error when I run the code.**
MKV reader initialized. Press [SPACE] to pause/start, [ESC] to exit.
[2021-02-04 12:11:29.096] [error] [t=9420] D:\a\1\s\extern\Azure-Kinect-Sensor-SDK\src\allocator\allocator.c (118): k4a_capture_t_get_context(). Invalid k4a_capture_t 0000016503094650
[2021-02-04 12:11:29.096] [error] [t=9420] D:\a\1\s\extern\Azure-Kinect-Sensor-SDK\src\allocator\allocator.c (344): Invalid argument to capture_get_color_image(). capture_handle (0000016503094650) is not a valid handle of type k4a_capture_t

**I hope to get help, thank you very much**