STG, problem with pop/push of alternative versions of a patch

I trying to test two different versions of a patch that add files. These patches create a new directory and add several files. When I pop a version of the patch the directory and files and not getting removed. This causes an error when I push the alternative version of the patch.

jonsmirl@terra:~/mpc5200b$ stg series
+ 0001-powerpc-exports-rheap-symbol-to-modules.patch
+ 0002-powerpc-Changes-the-config-mechanism-for-rheap.patch
+ 0003-powerpc-ppc32-Update-mpc52xx_psc-structure-with-B-r.patch
+ 0004-powerpc-BestComm-core-support-for-Freescale-MPC5200.patch
+ 0005-powerpc-BestcComm-ATA-task-support.patch
+ 0006-powerpc-BestcComm-FEC-task-support.patch
+ 0007-powerpc-BestcComm-GenBD-task-support.patch
+ ignore-uImage
+ 0008-drivers-net-Add-support-for-Freescale-MPC5200-SoC-i.patch
+ 0009-sound-Add-support-for-Freescale-MPC5200-AC97-interf.patch
+ 0010-powerpc-In-rheap.c-move-the-EXPORT_SYMBOL-and-use.patch
+ 0011-powerpc-BestComm-move-the-EXPORT_SYMBOL-and-use-th.patch
+ 0012-powerpc-BestComm-ATA-task-move-the-EXPORT_SYMBOL-a.patch
+ 0013-powerpc-BestComm-FEC-task-move-the-EXPORT_SYMBOL-a.patch
+ 0014-powerpc-BestComm-GenBD-task-move-the-EXPORT_SYMBOL.patch
+ 0015-powerpc-BestComm-Replace-global-variable-bcom-by-b.patch
+ 0016-powerpc-Make-the-BestComm-driver-a-standard-of_plat.patch
+ 0017-powerpc-Fix-typo-in-BestComm-ATA-task-support-code.patch
+ 0018-powerpc-BestComm-ATA-task-microcode-insert-copyri.patch
+ 0019-powerpc-BestComm-FEC-task-microcode-insert-copyri.patch
+ 0020-powerpc-BestComm-GenBD-task-microcode-insert-copy.patch
+ 0021-powerpc-Fix-errors-in-bcom-bcom_eng-renaming.patch
+ Makefile
+ pcm030_bsp_powerpc
+ fs_jffs2_use_memcpy_fromio
+ gpio_frame
+ ppc_gpio
+ GPIO-adaption
+ mpc52xx_restart

- domen-fec
jonsmirl@terra:~/mpc5200b$ stg pop
0008-drivers-net-Add-support-for-Freescale-MPC5200-SoC-i.patch..
Checking for changes in the working directory ... done
Popping patches "pcm_dts_eth_phys" -
"0008-drivers-net-Add-support-for-Freescale-MPC5200-SoC-i.patch" ...
done
Now at patch "ignore-uImage"
jonsmirl@terra:~/mpc5200b$ stg series
+ 0001-powerpc-exports-rheap-symbol-to-modules.patch
+ 0002-powerpc-Changes-the-config-mechanism-for-rheap.patch
+ 0003-powerpc-ppc32-Update-mpc52xx_psc-structure-with-B-r.patch
+ 0004-powerpc-BestComm-core-support-for-Freescale-MPC5200.patch
+ 0005-powerpc-BestcComm-ATA-task-support.patch
+ 0006-powerpc-BestcComm-FEC-task-support.patch
+ 0007-powerpc-BestcComm-GenBD-task-support.patch

- 0008-drivers-net-Add-support-for-Freescale-MPC5200-SoC-i.patch
- 0009-sound-Add-support-for-Freescale-MPC5200-AC97-interf.patch
- 0010-powerpc-In-rheap.c-move-the-EXPORT_SYMBOL-and-use.patch
- 0011-powerpc-BestComm-move-the-EXPORT_SYMBOL-and-use-th.patch
- 0012-powerpc-BestComm-ATA-task-move-the-EXPORT_SYMBOL-a.patch
- 0013-powerpc-BestComm-FEC-task-move-the-EXPORT_SYMBOL-a.patch
- 0014-powerpc-BestComm-GenBD-task-move-the-EXPORT_SYMBOL.patch
- 0015-powerpc-BestComm-Replace-global-variable-bcom-by-b.patch
- 0016-powerpc-Make-the-BestComm-driver-a-standard-of_plat.patch
- 0017-powerpc-Fix-typo-in-BestComm-ATA-task-support-code.patch
- 0018-powerpc-BestComm-ATA-task-microcode-insert-copyri.patch
- 0019-powerpc-BestComm-FEC-task-microcode-insert-copyri.patch
- 0020-powerpc-BestComm-GenBD-task-microcode-insert-copy.patch
- 0021-powerpc-Fix-errors-in-bcom-bcom_eng-renaming.patch
- Makefile
- pcm030_bsp_powerpc
- fs_jffs2_use_memcpy_fromio
- gpio_frame
- ppc_gpio
- GPIO-adaption
- mpc52xx_restart
- pcm_dts_eth_phys
- domen-fec
jonsmirl@terra:~/mpc5200b$ stg push domen-fec
Checking for changes in the working directory ... done
Pushing patch "domen-fec" ... error: drivers/net/fec_mpc52xx/Kconfig:
already exists in working directory
error: drivers/net/fec_mpc52xx/Makefile: already exists in working directory
error: drivers/net/fec_mpc52xx/fec.c: already exists in working directory
error: drivers/net/fec_mpc52xx/fec.h: already exists in working directory
error: drivers/net/fec_mpc52xx/fec_phy.c: already exists in working directory
fatal: Untracked working tree file 'drivers/net/fec_mpc52xx/Kconfig'
would be overwritten by merge.

  Error: The merge failed during "push".
         Use "refresh" after fixing the conflicts or revert the
operation with "push --undo".
stg push: git-merge-recursive failed with code 128
jonsmirl@terra:~/mpc5200b$ stg push --undo
Undoing push of "domen-fec" ... done
Now at patch "ignore-uImage"
jonsmirl@terra:~/mpc5200b$ stg status
? drivers/net/fec_mpc52xx/
jonsmirl@terra:~/mpc5200b$