If on importing models, usually ASE meshes, in to UDKs content browser the following error message appears (where "[n]" is a number/value);
"Generated/Imported vertex count ratio ([n]/[n]) exceeds expected percentage ([n] percent vs [n] percent expected)."
It's likely to be the results of one or more of the following;
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No UVW map present on the mesh
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No materials
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Not using a 'closed' mesh
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Excessive smooth group use
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More than two UVW maps
Check your mesh and re-export. This error usually occurs as a result of UDK adding more vertices than it 'expected' due to the above (it has to generate more vertices than was originally present).