File to RfC via proxy

Hi,

Scenario: downloading the file to an application server in cd1 from 3rd party system and after downloading, I need to pass the filename to an RFC.

I have a problem with calling an RFC inside the method in CD1(inbound proxy) it throws an exception. The file gets transfered successfully from XI to CD, however when it gets to CD1 there's a problem. It brings up the following error message:-

<SAP:Code p1="UNCAUGHT_EXCEPTION" p2="ZICL_MI_MCRTO_SAP_ISU_RBPL" p3="EXECUTE_ASYNCHRONOUS" p4="">APPLICATIONCALL.DYNAMIC_CALL_FAILURE</SAP:Code>

<SAP:Text language="EN">Unable to execute the dynamic application call (kernel error ID UNCAUGHT_EXCEPTION, class ZICL_MI_MCRTO_SAP_ISU_RBPL, method EXECUTE_ASYNCHRONOUS)</SAP:Text>