Fehlermeldung in C Programm auf AVR Studio

hier mal der Teil des Quellcodes der den Fehler verursacht:

#pragma vector=USART_RX_vect
__interrupt void rx_buffer_full(void) // <-- diese Zeile verursacht den 
Fehler !!!
{
  unsigned char ucValue;
  static unsigned char ucRXPrompt = 0;
                        // yes -> reset transmission
    ucValue = UDR2;              // read character from RX-buffer
    if(ucRXI == WAIT_STATE)          // last instruction evaluated?
    {
        if( ucValue == 0x3e )  // Prompt (>) detected
        {
          ucRXPrompt = 1;                            // set flag, that 
prompt was received
        }
        if( (ucValue == 0x0d) && (ucRXPrompt == 1) )  // Carriage Return 
detected
        {
          ucRXI = PROMPT_DETECTED;            // set flag, that answer 
was received completely
          ucRXPrompt = 0;
          ucSioPointer = 0;
        }
        else if(ucValue == 0x0d)
        {
        PORTH ^= (1<<PB5);
          if( (ucSioBuffer[ucSioPointer-2] == 'B') && ( 
ucSioBuffer[ucSioPointer-1] == 'C') )
          {
            PORTH ^= (1<<PB5);
            ucRXI = BAD_COMMAND;
          }
          else if( (ucSioBuffer[ucSioPointer-2] == 'C') && ( 
ucSioBuffer[ucSioPointer-1] == 'F') )
          {
            PORTH ^= (1<<PB5);
            ucRXI = COMMAND_FAILURE;
          }
          else if( (ucSioBuffer[ucSioPointer-2] == 'N') && ( 
ucSioBuffer[ucSioPointer-1] == 'D') )
          {
            PORTH ^= (1<<PB5);
            mode = 3;
            ucRXI = NO_DISK;
            PORTH ^= (1<<PB5);
          }
          ucSioPointer = 0;
        }
        else
        {
          if(ucSioPointer < SIO_BUFFER_SIZE)      // buffer full?
            ucSioBuffer[ucSioPointer++] = ucValue;// no->save character
          else                                    // yes -> buffer 
overflow (error)
          {
            ucRXI = WAIT_STATE;
            ucRXPrompt = 0;
            ucSioPointer = 0;
          }
        }
    }
}



Die Fehlermeldung ist wie folgt:

../uart.c:76: error: expected '=', ',', ';', 'asm' or '__attribute__' 
before 'void'



??? Was will er mir damit bloß sagen??