sdf to dae conversion problem

[ghost]

Hello

I am trying to convert a robot sdf file to .dae and I am using this command in the terminal:
simtrans -i "filename.sdf" -o "filename.dae"

But it gives me several warnings for each part of the robot such as:

INFO validating link base_link
WARNING the inertia matrix is far from the values estimated from bounding box of the shapes
or
WARNING jointId not set

and in the output in doesn't have all parts transferred to .dae.
I don't get where is the problem. Can you help me with this? If you need more information or codes please inform me.

Thank you
Best Regards