Importing my own OBJ file into Gazebo

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Hi guys, I'm trying to import my own .stl files into Gazebo. It works on a fresh gazebo environment but when I reopen the file using "sudo gazebo <filename>, it takes super long to load and upon using --verbose to check, it says

[Err] [MeshShape.cc64] Failed to find mesh file

It proceeds to tell me the filepath doesn't exist.

Funny thing is that I just copied the entire file for another working object and changed it accordingly to suit my files so I have no idea why this error pops up, can anyone help me ? Thanks

Sorry about the tags, I tried to post gazebo-11 as a tag but it still wouldn't let me through