ERROR : Unexpected error while launching prog

ERROR : Unexpected error while launching program. java.lang.RuntimeException: System Reset …. DONE
at com.xilinx.sdk.targetmanager.internal.TM.downloadELF(Unknown Source)
at com.xilinx.sdk.debug.core.internal.AppRunner.run(Unknown Source) I am getting This Error while  Porting LWIP APPlication of MicroBlaze_Spartan-6_EthernetLite Demo Application on Virtex-4 Board.Source code is compile.I am getting issue while Run RTOS Demo Launch on Hardrware.Can Any one have idea about this issue

ERROR : Unexpected error while launching prog

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