The possible cause of this error can be an inadequate graphics card for Freestyle.
Please try the suggestion provides in the post below.
http://forums.autodesk.com/t5/AutoCAD-Freestyle/Freestyle-crashes-at-start-up/td-p/2692096
If the suggestions in the post do not help, please uninstall Freestyle, disable your Internet security application and antivirus, and reinstall Freestyle.
Avto Chachava
Autodesk Product Support
Autodesk, Inc.