I have faced this problem when I have exported my work-space from Windows 7 x64 jvm7 x64 and Imported that project in eclipse on my Ubuntu 12.04.
ERROR: " Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties. "
Solution of this problem is to set project compatibility to java 5.0 to java6.0.
You can do that in two way:
1. right-click on your project and select "Android-Tools -> Fix Project Properties " [If this solution doesn't work then apply second options ]
2. right-click on your project and select "Properties->Java Compiler " , Check "Enable project specific settings " and select 1.5 or 1.6 from "Compiler compliance settings" select box.
My problem solved by following the first options. Hope you will get your solution from here.
