"Install.sh" FATAL ERROR: IndexError: tuple index out of range

Here's the error:

> Compiling AccessTransformer

FATAL ERROR

Traceback (most recent call last):

  File "/Users/Emmanuel/Documents/Projects/Eclipse/Mods/EmmanuelMess_Mods{1.6.4}[Forge]/forge/mcp/runtime/decompile.py", line 136, in decompile

    keep_lvt=keep_lvt, keep_generics=keep_generics, force_rg=force_rg)

  File "/Users/Emmanuel/Documents/Projects/Eclipse/Mods/EmmanuelMess_Mods{1.6.4}[Forge]/forge/mcp/runtime/mcp.py", line 34, in decompile_side

    commands.applyss(side, keep_lvt=keep_lvt, keep_generics=keep_generics)

  File "/Users/Emmanuel/Documents/Projects/Eclipse/Mods/EmmanuelMess_Mods{1.6.4}[Forge]/forge/fml/fml.py", line 957, in applyss_shunt

    transformers_hook(self, side)

  File "/Users/Emmanuel/Documents/Projects/Eclipse/Mods/EmmanuelMess_Mods{1.6.4}[Forge]/forge/fml/fml.py", line 994, in transformers_hook

    if not runcmd(cmd_compile.format(target=os.path.join(dir_trans, 'AccessTransformer.java')), commands=self, echo=False):

IndexError: tuple index out of range

Decompile Exception: 1

logout

Here's the file "install.command" (originally "install.sh"):

cd "`dirname "$0"`"

chmod +x install.command

#!/bin/bash

python install.py "$@"

As additional data I must say i'm working in Mac OS X 10.9 "Mavericks" environment.

Thanks for reading,

Emmanuel