Objects not showing in Ignition

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Hi, I am trying to add objects through mesh (dae) files in Ignition Gazebo. I am using an sdf script for it and have followed the details from this link https://gazebosim.org/api/gazebo/3.7/.... The files are saved in local computer. However, when I launch the sdf file, an empty world shows up with only white screen. No error is shown on the console. The entities are also shown on the side bar but no object appears.

How can the models show up ?