Error when using Zedai to Pef

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I keep getting the following error when converting Zedai to Pef. I am trying to implement a custom CSS

[WS] ERROR(4) - px:brl03:Translation failed: javax.xml.transform.TransformerException: Stylesheet module http://www.daisy.org/pipeline/modules/braille/css-utils/library.xsl is included or imported more than once.
This is permitted, but may lead to errors or unexpected behavior
javax.xml.transform.TransformerException: Stylesheet module bundle://116.0:1/xml/parsing-helper.xsl is included or imported more than once.
This is permitted, but may lead to errors or unexpected behavior
javax.xml.transform.TransformerException: Stylesheet module http://www.daisy.org/pipeline/modules/braille/css-core/supported-css.xsl is included or imported more than once.
This is permitted, but may lead to errors or unexpected behavior
javax.xml.transform.TransformerException: Stylesheet module bundle://127.0:1/xml/regex-utils.xsl is included or imported more than once.
This is permitted, but may lead to errors or unexpected behavior
net.sf.saxon.trans.XPathException: Cannot find a matching 2-argument function named {http://liblouis.org/liblouis}hyphen
[DP2] ERROR

Is this due problem with my CSS ?

Thanks in advance
Syed

I am using Windows 7 64bit.
The main issue I am facing is that of the Webservice. Sometimes it fails to load some of the modules. These are the type of errors I get :

- [WS] ERROR(1) - px:brl01:Could not load translator http://www.daisy.org/pipeline/modules/braille/xml-to-pef/translation/gen....
net.sf.saxon.trans.XPathException: Cannot find a matching 1-argument function named {http://hunspell.sourceforge.net/Hyphen}resolve-table()

- [WS] ERROR(1) - Cannot import: http://www.daisy.org/pipeline/modules/metadata-utils/library.xpl