problem when running viz.py

[ZhangRenkai]

python viz.py --architecture gcn --non_local --evaluate checkpoint/pretrained/ckpt_semgcn_nonlocal.pth.tar --viz_subject S11 --viz_action Walking --viz_camera 0 --viz_output output.gif --viz_size 3 --viz_downsample 2 --viz_limit 60

When I do this step above, I encountered the following problem and I don't know how to solve it.

==> Loading dataset... ==> Preparing data... ==> Loading 2D detections... ==> Creating model... ==> Total parameters: 0.43M ==> Loading checkpoint 'checkpoint/pretrained/ckpt_semgcn_nonlocal.pth.tar' ==> Loaded checkpoint (Epoch: 16 | Error: 41.1463412364) ==> Rendering... Generating 1621 poses...

Traceback (most recent call last): File "viz.py", line 192, in <module> main(parse_args()) File "viz.py", line 141, in main input_video_skip=args.viz_skip) File "/root/SemGCN-master/common/visualization.py", line 180, in render_animation anim.save(output, dpi=80, writer='imagemagick') File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 1200, in save writer.grab_frame(**savefig_kwargs) File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__ self.gen.next() File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 241, in saving self.finish() File "/usr/local/lib/python2.7/dist-packages/matplotlib/animation.py", line 563, in finish .format(self._proc.returncode)) RuntimeError: Error creating movie, return code: 1