Error while building app inventor using ant as given in image down 
This is a Java related error in your changes and not something specific to App Inventor. Your use of Windows-style path characters is causing the problem and you need to escape them with an additional \ character. If you're looking to build your own version of App Inventor, I would strongly recommend that you become better acquainted with the Java language first.
1 Like
Replace all occurrences of \ in the paths with either \\ or /.
already solved befor you but forget to delet the post otherwise, Thank you for your Suggestion
Please describe your solution then to help others with the same problem in future
Taifun
I just removed \ fromImages.java from line 727 and done it /