gstreamer error(from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Internal data flow error.)

[jah05]

*I am trying to do rtp communication using gstreamer but I get this error.
Please help fix the error! Please!*
gst-launch-1.0 -v v4l2src device=/dev/video0 ! video/x-raw,width=640,
heigth=480 ! videoconvert ! x264enc ! rtph264pay ! udpsinkhost=127.0.0.1
port=5000 
> Setting pipeline to PAUSED ... Pipeline is live and does not need
> PREROLL ... Setting pipeline to PLAYING ... New clock: GstSystemClock
> ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> Internal data flow error. Additional debug info: gstbasesrc.c(2948):
> gst_base_src_loop (): /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> streaming task paused, reason not-negotiated (-4) Execution ended
> after 0:00:00.002814879 Setting pipeline to PAUSED ... Setting
> pipeline to READY ... Setting pipeline to NULL ... Freeing pipeline
> ...




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