cannot open display问题

[haha911]

./build/facedet_test data/0_1_1.jpg model/seeta_fd_frontal_v1.0.bin 我使用这个命令，还是提示
Detections takes 0.11397 seconds
OpenMP is used.
SSE is used.
Image size (wxh): 550x694

(Test:25168): Gtk-WARNING **: cannot open display:
有人知道吗？