Quality analysis control doubts

I had run the quality analysis control for my code base and i have some doubts regarding some error value seen which is shown below:

this is just the code extract

typedef struct UISR_caller_info_s/*structure declaration*/
{
    unsigned char   number[20];    
    unsigned char   Name[30];
    unsigned int  numberType;                      
} caller_t;

static caller_t   gs_val;/*variable of the structure type*/

Error:

 2027:  strcpy((char *)gs_val.Name, NULL); 
                       ^
Msg(2:0310) Casting to different object pointer type. 
REFERENCE - ISO:C90-6.3.4 Cast Operators - Semantics <next> 

The error is shown at the char * typecasting which i really have no idea why thi开发者_开发知识库s is happening. Please let me know how to avoid this kind of error

Thanks GNR

First of all, that strcpy call will likely cause a segmentation fault (and definitely causes undefined behaviour) - you probably don't want NULL for the second parameter. You don't need the cast for your call anyway:

strcpy(gs_value.Name, "");

Will work fine, and is probably what you meant in the first place. It may be that your compiler is very picky, and it's complaining about the cast from unsigned char to char - you can fix that by changing your structure appropriately.