GP CO implemention package imports error

Hi Frndz..

Am just implemanting the GP CO , so in the impemantion of Interface controller when am adding the below imports itz giving error how i can resolve this

import com.sap.caf.eu.gp.co.api.GPCallableObjectFactory;

import com.sap.caf.eu.gp.co.api.GPWebDynproResourceAccessor;

import com.sap.caf.eu.gp.co.api.IGPCOResultStateInfo;

And also by default in thid Interface Controller impelmantion am getting an error like

"This compilation unit indiresctly refernces the missing type com.sap.caf.eu.gp.co.api.IGPTechnicalDescription(typically some required class file is referncing out side the classpath)"

Am uysing NWDS 7.0.09 and java is JDK1.5.0_01

I

If any ideas plz share with me..

Thanks in Advance

Regards

Rajesh