unacceptable character '?' (0xFFFD) special characters are not allowed (1.6.2 Beta)

Hey Developer.

Sry for opening a second thread of this problem but i think the old Thread is not activ anymore so i have open a new Thread. I hope it's not bad.

So now the problem.

For some day I tried to create a server on Debian 7.0.0. The server works fine but some plugins fail with the Error: unacceptable character '?' (0xFFFD)






I had read the posts of the old thread to fix this problem but if I use "iconv" it will fail with this error message:

2013-08-11 17:17:39 [SEVERE] Could not load 'plugins/ecoCreature.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml

On Windows, it works fine but on Debian it failed.

The "locale" is:

LANG=de_DE@euro
LANGUAGE=
LC_CTYPE="de_DE@euro"
LC_NUMERIC="de_DE@euro"
LC_TIME="de_DE@euro"
LC_COLLATE="de_DE@euro"
LC_MONETARY="de_DE@euro"
LC_MESSAGES="de_DE@euro"
LC_PAPER="de_DE@euro"
LC_NAME="de_DE@euro"
LC_ADDRESS="de_DE@euro"
LC_TELEPHONE="de_DE@euro"
LC_MEASUREMENT="de_DE@euro"
LC_IDENTIFICATION="de_DE@euro"
LC_ALL=

I hope you can help me to resolve this problem.
Thank You very much.