We just encountered this identical error with a new COTS USB camera we would like to use for this season.
The roboRIO sends a single image to the smart dashboard when the code starts. Then the above error is spammed on the driver's station until the robot is shut off. The error is in the capture() method of the CameraServer class in the wpi library.
This is the camera we're attempting to use.
Is there a way to contact the wpilib team to report this bug?
We really want to use this camera in particular because of its fisheye lens. Is there an alternate way to display a USB camera on the driver's computer?