should be using JavaSE-1.6 VM, and .classpath, codegen.targetPlatform, compliance and source should also all be 1.6
<?xml version="1.0" encoding="UTF-8"?>
<?eclipse version="3.0"?>
<plugin>
<extension-point id="nameAlgorithm" name="nameAlgorithm" schema="schema/nameAlgorithm.exsd"/>
<extension
id="com.nokia.sdt.sourcegen.provider"
name="Symbian Source Generation Provider"
point="com.nokia.sdt.uimodel.sourceGenProvider">
<provider
class="com.nokia.sdt.sourcegen.provider.SourceGenProvider"
name="com.nokia.sdt.sourcegen.Symbian-Provider"/>
</extension>
</plugin>