Return error -12905 what does it mean?

Hi,

I am using xcode with openframeworks for camera brightness tracking. And I had this error in the console:

brightnessTrackingVideoDebug[44369:2071940] [] CMIOUnitConvertor_VideoToolboxDecompressor.cpp:3373:decompressionOutputHandler [0x103869e00] DECODING ERROR -12905

And my camera is not turned on, I got a blank canvas. Anyone knows how can I fix this? thank you!