required assets

That library may require assets that are only installed with a Panda3D distribution and with a correct Prc. That may lead to runtime error since assets are not checked on startup.

eg

DirectGuiExtension/DirectGuiExtension/DirectSpinBox.py

Line 139 in e6fe8bb

shuttle_controls_font = loader.loadFont('shuttle_controls')

on android and browser - where runtime is per application - the full distribution is not usually available.

One other place that contains assets from the engine is here:

DirectGuiExtension/DirectGuiExtension/DirectTreeView.py

Lines 23 to 24 in e6fe8bb

    
           ('imageCollapse', "icons/minusnode.gif", DGG.INITOPT), 
        
           ('imageCollapsed', "icons/plusnode.gif", DGG.INITOPT),

	('imageCollapse', "icons/minusnode.gif", DGG.INITOPT),
	('imageCollapsed', "icons/plusnode.gif", DGG.INITOPT),