conflicting type for funct in C

Iam trying to run the below code and iam getting below error msg-

Program:-

int main()
{
    int (*res)[3],i;
    res=func();


}

int (*func())[3]
{
    static int arr[3][3]={1,2,3,4,5,6,7,8,9};
    return arr;
}

Error:

PointerTo1D.c: In function ‘main’:
PointerTo1D.c:6:5: warning: assignment makes pointer from integer without a cast [enabled by default]
  res=func();
     ^
PointerTo1D.c: At top level:
PointerTo1D.c:11:7: error: conflicting types for ‘func’
 int (*func())[3]
   ^

PointerTo1D.c:6:6: note: previous implicit declaration of ‘func’ was here res=func();

Could someone please help me out here???