pic 18f2550 , micro sd and MikroC

Hey everyone
i want to interface my micro sd with pic 18f2550 , i format it with FAT 16 and i used the code in the mmc help section
here is my code :

Code ( (Unknown Language)):

1.  
2. // MMC module connections
3. sbit Mmc_Chip_Select           at LATC0_bit;  // for writing to output pin always use latch (PIC18 family)
4. sbit Mmc_Chip_Select_Direction at TRISC0_bit;
5. // eof MMC module connections
6.  
7.  int i;
8.  
9. void main() {
10.   ADCON1 |= 0x0F;                  // Configure AN pins as digital
11.   CMCON  |= 7;                     // Turn off comparators
12.   trisa = 0x00;
13.  
14.   // Initialize SPI1 module
15.   SPI1_Init_Advanced(_SPI_MASTER_OSC_DIV64, _SPI_DATA_SAMPLE_MIDDLE, _SPI_CLK_IDLE_LOW, _SPI_LOW_2_HIGH);
16.     while (1)
17.     {
18.    i = Mmc_Fat_Init();
19.  switch (i)
20.    {
21.       case 0 : porta = 0b00000001; break;
22.       case 1 : porta = 0b00000010; break;
23.       case 255 : porta = 0b00000011; break;
24.       default: porta = 0xff; break;
25.       }
26.       delay_ms(50);
27.      }
28. }}
29.  

i always get 255
i even tried with MMC_INIT() with no result
can u please guide me to the problem ?