visualization.py has error?why?

[henbucuoshanghai]

python run.py -k cpn_ft_h36m_dbb -arc 3,3,3,3,3 -c checkpoint --evaluate pretrained_h36m_cpn.bin --render --viz-subject S11 --viz-action Walking --viz-camera 0 --viz-video "1.mp4" --viz-output output.mp4 --viz-size 3 --viz-downsample 2 --viz-limit 60

frame= 689 fps=226 q=-0.0 Lsize= 4185675kB time=00:00:22.90 bitrate=1496984.0kbits/s speed=7.52x
video:4185675kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%
VideoPose3D/common/visualization.py:198: UserWarning: Tight layout not applied. The left and right margins cannot be made large enough to accommodate all axes decorations.
fig.tight_layout()

I change nothing.why???? tks