Could somebody help me out with my Radeon 4870, the miner is not working:

[08:57:28] Start sgminer with -T to see what failed to load.
[08:57:28] Kernel x11mod is experimental.
[08:57:30] Error -11: Building Program (clBuildProgram)
[08:57:30] "C:\Users\XX\AppData\Local\Temp\OCLB297.tmp.cl", line 7710: error: f
unction
          "get_global_offset" declared implicitly
      __global hash_t *hash = &(hashes[gid-get_global_offset(0)]);
                                           ^

"C:\Users\XX\A
[08:57:30] Failed to init GPU thread 0, disabling device 0
[08:57:30] Restarting the GPU from the menu will not fix this.
[08:57:30] Try restarting sgminer.
Press enter to continue: