Reading very big XML file (4GB) into a char* for parsing (Syscall param read(buf) points to unaddressable byte(s)

Here i am trying to read a very big XML file into a char*, but i am getting the following Error:

(Syscall param read(buf) points to unaddressable byte(s))

It is pointing to the line-> size= fread(result,sizeof(char),size,file);

I am using Valgrind for debugging the Segmentation fault. Help are very much appreciated

EDIT: I just ran a test and found out that result is actually pointing to NULL meaning it cannot allocate that much. What am i supposed to do then ?

// Converts XML file to Char*
char* XMLtoString(char* path){
    FILE* file;
    unsigned long long size;
    char* result;

    file = fopen(path,"r");
    fseek(file,0,SEEK_END);  
    size = ftell(file);
    fseek(file,0,SEEK_SET);
    result = (char*)malloc((sizeof(char)*size)+1);
    size = fread(result,sizeof(char),size,file);
    result[size] = '\0';
    fclose(file);
    return result;
}