Could not initialize supporting library (omxh264dec-omxh264dec0)

[HongLe1007]

I use Petalinux to build the system run on ZCU102 board. I have played .webm video format sucessfully, but when I try to play a .mp4 video format I met an error:
The error is shown below, could you help me out?

root@xilinx-zcu102-2020_1:~/honglc_samples/segmentation# gst-launch-1.0 filesrc location=./video/traffic.mp4 ! qtdemux name=demux demux.video_0 ! h264parse ! omxh264dec ! queue max-size-bytes=0 ! kmssink bus-id=fd4a0000.zynqmp-display fullscreen-overlay=1
Setting pipeline to PAUSED ...
[2020-08-19 05:02:20.494530490] [omx_core.cpp:181] [OMX_GetHandle] Couldnt allocate dma allocator (tried using /dev/allegroDecodeIP)
ERROR: Pipeline doesn't want to pause.
ERROR: from element /GstPipeline:pipeline0/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0: Could not initialize supporting library.
Additional debug info:
../../../../git/gst-libs/gst/video/gstvideodecoder.c(2614): gst_video_decoder_change_state (): /GstPipeline:pipeline0/GstOMXH264Dec-omxh264dec:omxh264dec-omxh264dec0:
Failed to open decoder
Setting pipeline to NULL ...
Freeing pipeline ...