gscam error "libv4l2: error getting capabilities: Inappropriate ioctl for device"

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I installed gscam sucsessfully. But when i run rosrun gscam gscam i have some fatal errors:

    Failed to query video capabilities: Inappropriate ioctl for device
libv4l2: error getting capabilities: Inappropriate ioctl for device
[FATAL] [1502312548.166131869]: Failed to PAUSE stream, check your gstreamer configuration.
[FATAL] [1502312548.166271659]: Failed to initialize gscam stream!

Gscam config is:

export GSCAM_CONFIG="v4l2src device=/dev/fb0 ! video/x-raw-rgb,framerate=30/1 ! ffmpegcolorspace"

Please, help!