Assistance with Opening and Processing Bag Files in Open3D After Calibration

[AliZoi]

Hello, i need help! Im trying a new project for my master and i need to open and process a bag file from rgbd camera intel real sense. At first everything was perfect and bag file opens and extract 2 folders(depth, rgb) and intrinsic json file. After calibration via Intel real sense viewer i have this message:
[Open3D WARNING] Unable to open file C:/Users/zazou/Documents/20231009_172627.bag
Traceback (most recent call last):

File c:\users\zazou\appdata\local\programs\python\python39\lib\site-packages\spyder_kernels\py3compat.py:356 in compat_exec
exec(code, globals, locals)

File c:\users\zazou.spyder-py3\temp.py:9
bag_reader.save_frames(output_path,0,18446744073709551615)

RuntimeError: [Open3D Error] (void __cdecl open3d::t::io::RGBDVideoReader::SaveFrames(const class std::basic_string<char,struct std::char_traits,class std::allocator > &,unsigned __int64,unsigned __int64)) D:\a\Open3D\Open3D\cpp\open3d\t\io\sensor\RGBDVideoReader.cpp:37: Null file handler. Please call Open().

[Open3D Error] (void __cdecl open3d::t::io::RGBDVideoReader::SaveFrames(const class std::basic_string<char,struct std::char_traits,class std::allocator > &,unsigned __int64,unsigned __int64)) D:\a\Open3D\Open3D\cpp\open3d\t\io\sensor\RGBDVideoReader.cpp:37: Null file handler. Please call Open().

whats the deal?