Hi Gustavo !
This message, given at the end of the log, says that Polyspace has detected cross-files errors.
"Cross-files errors" are problems detected by Polyspace when the tool is checking the "consistency" of the files (after a phase where Polyspace checks each file independently).
You will find more information on this kind of errors in the documentation: http://fr.mathworks.com/help/codeprover/ug/c-link-errors.html
If you look earlier in the log, you will see the precise errors found by Polyspace, with messages similar to the ones given in the documentation.
Regards,
Alexandre