can't register gtkwidget

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i am running cv_camera_node in client ros node and rqt_image_view in another ros node running in pi 4 B. I'm using both pi4B. Here i have attached touchscreen in one pi where i'm trying to run rqt_image_vidw. but after i check everything like topics and echo them and try to show them in image_view i get warnings like can't register gtkwidget and others. and the camera node also stoops after that. i've made the camerea node pi ad wireless access point and connected another pi with it wirelesly.