RFC ERROR SYSTEM FAILURE

Hi ,

I m working with an application which uses TRIP and EXPENCE functionalities.

but when i run this application into iPhone environment i m getting error i.e

exception = "com.sap.aii.proxy.framework.core.BaseProxyException: Screen output without connection to user

error key: RFC_ERROR_SYSTEM_FAILURE";

    "status_code" = 500;

    "status_msg" = "Exception :Screen output without connection to user., error key: RFC_ERROR_SYSTEM_FAILURE"

Please help me out

Thanks in advance.