10 Bit ADC

First, I thank keil.com for this forum...

I am using C515C, and I connected it to an LCD.

When I convert an analog signal coming from P6.1 to 8 bit, the output is right.

But when I convert the signal to 10 bit resolution, at the program execution reaches the conversion function it goes back to the start of the program...!!
I feel that the problem is in using the "unsigned int " for the 10 bit..
Could you help me please...

-----------------------------------------------
The program (8 bit conversion) -working fine-

unsigned char kk;
. .
void main()
{ .
. ADC_vStart(0,1);
kk = ADC_ubRead8BitConv();
. .
}

----------------------------------------------
The program (10 bit conversion) -NOT Working-

unsigned int kk;
. .
void main()
{ .
. ADC_vStart(0,1);
kk = ADC_ubRead10BitConv();
. .
} ---------------------------