External Compiler error
The problem was on the System Path.
I make a start.bat as follow:
@ECHO OFF
set PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Ac6\SystemWorkbench;C:\ProgramData\Oracle\Java\javapath;
eclipse.exe
and now the internal compiler works.