Multiple camera error - [usb_cam_node_exe-2] terminate called after throwing an instance of 'char*'

[luisgrana2]

I am new working with two cameras using the usb_cam, and I keep encountering the same error: [usb_cam_node_exe-2] terminate called after throwing an instance of 'char*'.
I add this to the launch camera.launch.py.
`CAMERAS = []
CAMERAS.append(
CameraConfig(
name='camera1',
param_path=Path(USB_CAM_DIR, 'config', 'params_1.yaml')
)
)

CAMERAS.append(
CameraConfig(
name='camera2',
param_path=Path(USB_CAM_DIR, 'config', 'params_2.yaml')
)
)`

and

params_2.yaml is exactly the same as params_1, but I change the vid_device, in paramas_1.yaml I have /dev/video5.

/**: ros__parameters: video_device: "/dev/video5" framerate: 30.0 io_method: "mmap" namespace: "cam2" frame_id: "camera2" pixel_format: "yuyv" # see usb_cam/supported_formats for list of supported formats image_width: 640 image_height: 480 camera_name: "camera2" camera_info_url: "package://usb_cam/config/camera_info.yaml" brightness: -1 contrast: -1 saturation: -1 sharpness: -1 gain: -1 auto_white_balance: true white_balance: 4000 autoexposure: true exposure: 100 autofocus: false focus: -1

Any idea of the error?

[flynneva]

@luisgrana2 this error comes from trying to open a device that either doesnt exist or isnt a v4l2 device (see issue #285). I've tried to improve the error reported with PR #286 👍🏼 sorry for the confusion!