error message

Hi everybody <!– s;) –><img src="{SMILIES_PATH}/icon_e_wink.gif" alt=";)" title="Wink" /><!– s;) –>
When i export a model from 3dcrafter,once i am in blue print editor ,i receive this message ,with simple shape or no:
ERROR:Geometry with vertices but no triangles !
LINE 171

Why this silly message with a cube with 6 faces?

Thanks a lot if you can help me

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