Error while connecting to ECC using JCO3 connection

Hi,

I am getting an error when using JCO3 for connection. I have specified the connection string and created the destination object.

I get a null pointer exception while setting the import parameter for the RFC. the error is as shown below.

java.lang.NullPointerException:
while trying to invoke the method
com.sap.conn.jco.JCoFunction.getImportParameterList() of a null object loaded
from local variable 'function'

the sample code is as follows:-

destination =JCoDestinationManager.getDestination("ECC destinaton");

function = destination.getRepository().getFunction("RFC name");

function.getImportParameterList().setValue("import parameter name", import parameter value);

function.execute(destination);

the errror occurs at the line highlighted in red.

Quick response appreciated.