'Why do I get a Save Error when exporting to (.U3D)?

I'm ultimately trying to create a PDF file from Blender. I was told I have to export (.dae) file in Blender. Then open (.dae) file in Meshlab. Then export (.u3d) file in Meshlab. This is the point I get a "Meshlab Saving Error" Unknown Error (-2147483645). The (.u3d) file never gets created.



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