Change build.properties to include xtend-gen folder instead of src-gen.

HintCOEngine/build.properties

@@ -1,13 +1,13 @@
 source.. = src/,\
            test/,\
-           src-gen/,\
+           xtend-gen/,\
            lib/nativebinaries/
 bin.includes = META-INF/,\
                .,\
                plugin.xml,\
                plugin.properties,\
                src/,\
-               src-gen/,\
+               xtend-gen/,\
                test/,\
                resources/,\
                lib/fmi2.jar,\