ARM scatter file symbols not defined?

In my scatter file, I have a memory region named TCM_COPY,

In my C file, i am trying to extern the region_name like,

extern unsigned int Image$$TCM_COPY$$Base.

But when I compile that C file, the ARM compiler generates an error;

L6218E: Undefined symbol Image$$TCM_COPY$$Base.

I am wonder why I can't import that region symbol from my scatter file??