This error is commonly associated with special characters such as é, ñ, or ö being present in one of the following user configurable text areas of your profile: model names, process names, or the process' scripts tab. Removing these characters from any of these areas will almost always cease the appearance of warnings for incorrectly encoded xml files.
Other examples of such cases can be seen on our forums, where seemingly all cases are solved in the manner specified above.
viewtopic.php?f=9&t=2886#p12207
Please let me know if you continue to see this error after clearing the aforementioned areas of special characters.