cocoon start from command line

Hi,

I always get the same kind of error message trying to call cocoon from the 
command line.
Cocoon can't find my DTD file specified in my XML document.

I call cocoon like this:
java org.apache.cocoon.Cocoon -p ~/cocoon.properties mitg.xml m.html

and what I get is this:
-----------------------------------snip---------------------------------

Exception in thread "main" File "sciencedoc.dtd" not found. [FATAL ERROR]
[File:
 "" Line: -1 Column: -1]
        at
org.apache.cocoon.parser.AbstractParser.fatalError(AbstractParser.jav
a:105)
.
.
-----------------snap---------------------------------------------------

And this is the head of my xml file:
-----------------------snip---------------------------------------------
<?xml version="1.0" encoding="iso-8859-1"?>
<?xml-stylesheet href="psycho12.xsl" type="text/xsl"?>
<?cocoon-process type="xslt"?>

<!DOCTYPE sciencedoc SYSTEM "sciencedoc.dtd">

<sciencedoc>
--------------------snap-------------------------------------------------

What am I doing wrong???

Thanks a lot for your help in advance.


Bye,
        Sebastian





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