This message means that a CAD file was found that we cannot process. The reason as we saw it is given in the message. Please try to open the file with your CAD system. If it seems to be fine, send it to us for analysis. If not, there may be a problem to be addressed at your end.
--Preprocessing drawing 20110F6A.CAD Bad CAD magic number: read 15686, expected 51920 Invalid record length -1
This error can be built directly into Hyperview. For more information, see the article Building error reports into the M14.