Default [Q] Need help in porting slimbean

Well I was trying to port slimben for my acer a500 and the build goes well until the last few steps when trying to make a zip file. Can you guys help me take a look thank you!
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Made boot image: out/target/product/a500/boot.img
----- Making recovery image ------
out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/a500/kernel  --ramdisk out/target/product/a500/ramdisk-recovery.img --base 0x10000000 --output out/target/product/a500/recovery.img
Made recovery image: out/target/product/a500/recovery.img
out/target/product/a500/recovery.img maxsize=5136384 blocksize=135168 total=4249600 reserve=270336
Construct recovery from boot
mkdir -p out/target/product/a500/obj/PACKAGING/recovery_patch_intermediates/
PATH=out/host/linux-x86/bin:$PATH out/host/linux-x86/bin/imgdiff out/target/product/a500/boot.img out/target/product/a500/recovery.img out/target/product/a500/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p
Construct patches for 3 chunks...
patch   0 is 205 bytes (of 2838538)
patch   1 is 1242964 bytes (of 170881)
patch   2 is 153 bytes (of 1141)
chunk   0: normal   (         0,    2838538)         205
chunk   1: deflate  (   2838538,    1410471)     1242964  (null)
chunk   2: normal   (   4249009,        591)         153
Install system fs image: out/target/product/a500/system.img
out/target/product/a500/system.img+out/target/product/a500/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize=1310318592 blocksize=135168 total=195068238 reserve=13246464
Package target files: out/target/product/a500/obj/PACKAGING/target_files_intermediates/
Package OTA: out/target/product/a500/
./build/tools/releasetools/ota_from_target_files -v \
	   -p out/host/linux-x86 \
	   -k build/target/product/security/testkey \
	   --backup=true \
	   --override_device=picasso,a500 \
	   out/target/product/a500/obj/PACKAGING/target_files_intermediates/ out/target/product/a500/
unzipping target target-files...
  running:  unzip -o -q out/target/product/a500/obj/PACKAGING/target_files_intermediates/ -d /tmp/targetfiles-91NFVw
--- target info ---
blocksize                 = (int) 131072
boot_size                 = (int) 8388608
default_system_dev_certificate = (str) build/target/product/security/testkey
extfs_sparse_flag         = (str) -s
fs_type                   = (str) ext4
fstab                     = (dict) {'/flexrom': <common.Partition object at 0x1e48150>, '/cache': <common.Partition object at 0x1e480d0>, '/boot': <common.Partition object at 0x1e44ed0>, '/system': <common.Partition object at 0x1e48050>, '/mnt/sdcard': <common.Partition object at 0x1e48250>, '/recovery': <common.Partition object at 0x1e44e50>, '/data': <common.Partition object at 0x1e481d0>}
recovery_api_version      = (int) 2
recovery_size             = (int) 5242880
system_size               = (int) 1283457024
tool_extensions           = (str) device/acer/a500/../common
userdata_size             = (int) 13950255104
using device-specific extensions in device/acer/common
unable to load device-specific module; assuming none
Traceback (most recent call last):
  File "./build/tools/releasetools/ota_from_target_files", line 901, in <module>
  File "./build/tools/releasetools/ota_from_target_files", line 869, in main
    WriteFullOTAPackage(input_zip, output_zip)
  File "./build/tools/releasetools/ota_from_target_files", line 448, in WriteFullOTAPackage
  File "/home/user/slim4.1/build/tools/releasetools/", line 157, in Mount
    (p.fs_type, common.PARTITION_TYPES[p.fs_type],
KeyError: 'auto'
make: *** [out/target/product/a500/] Error 1
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