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This is more of a https://answers.gazebosim.org/questions/ question than a ROS question, so I'd encourage you to use the dedicated Gazebo site in the future... But this is a very common issue and almost always comes down to Gazebo not finding your .dae file on its model path.
There are 3 log files that you can check that often shed some light:
~/.gazebo/gzclientXXX/default.log
~/.gazebo/gzserverXXX/default.log
~/.gazebo/ogre.log
You will likely find a "file not found" error
(Also see:)