Error C213

Hello,

In trying to compile the C code with the C51
compiler [Keil µvision2], I received error c213 "left side of asn-op not an lvalue" -
" the address of a changeable object is required at the right side of the
assignment operator". But i don't know where is/are problems...

Code:
#include <Chipcon\srf04\regssrf04.h>
#include <Chipcon\srf04\halsrf04.h>
#include <Chipcon\srf04\ebsrf04.h>
#include <ctype.h>

#define TX_entree 0x80 //P0.4
#define RI0 0x98

BYTE idata txBuffer[8];
BYTE idata buffer[8];
int i = 0;
int taille_tab;

void main () {

#ifdef STAND_ALONE

CLOCK_INIT();
IO_PORT_INIT();

#endif

ebLcdInit();
ebLcdUpdate("Emission test v0.1", NULL);
halWait(3000);
ebLcdUpdate("Initialisation", NULL);
halWait(2000);
halUartSetup(UART_BAUDRATE_115200, DEFAULT_MODE);

SPI_INIT(SCLK_6_MHZ);
POWER_UP_RESET_CCxxx0(); FIRST ERROR
UART_RX_ENABLE();
ebLcdUpdate("Reception et stockage des données en cours", NULL);
halWait(3000);


if(RI0 == 1){
//stockage des données
taille_tab = sizeof(buffer);
for (i = 1; i < taille_tab; i++) {
UART_WAIT_AND_RECEIVE(buffer[i]); SECOND ERROR IF I COMMENT THE FIRST
}
}
ebLcdUpdate("Emission des données en cours", NULL);
halWait(2000);
SPI_ENABLE();
halRfSendPacket(buffer, sizeof(buffer));
ebLcdUpdate("Fin", NULL);
halWait(2000);
}

Any help or comments appreciated. I'm workin' on the CC2500DK, it's an tranceiver HF and many fonctions has already created by the constructor.

Thanks

John