An unhandled win32 exception occurred in armcc.exe [2268]

Hi friends,
I am using Keil RVMDK 4.10 for Stellaris LM3S6965 micro-controller.

An exception error occurred when compiling Test.c file, which uses external "__attribute__((bitband))" structure.

Header file Test.h

typedef unsigned int uint32_t;

//! @brief structure for bit mapped variables

typedef struct  __ST_BITBAND
{
        uint32_t Bit0:1;          //!< Bit 0 of the variable

}ST_BITBAND __attribute__((bitband));



extern ST_BITBAND Var;      // Var is externally declared


#define Modbus_Flag Var.Bit0    // Assigned the name for bit 0 of Var

Source file Test.c

#include "Test.h"


void Func(void)
{
        Modbus_Flag = 1;      // Set the Bit 0 of Var variable
}

When I compile the Test.c, compiler gives Exception.

Please suggest me any work around for this.

Thanks,
Kishore.