gst-launch-1.0 audiotestsrc ! voaacenc ! mpegtsmux ! filesink location=aac.ts Internal data flow error

[zhang]

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstAudioTestSrc:audiotestsrc0: Internal data flow error.
Additional debug info:
gstbasesrc.c(2943): gst_base_src_loop (): /GstPipeline:pipeline0/GstAudioTestSrc:audiotestsrc0:
streaming task paused, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...


I compile source code, version 1.5.2
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