simple xslt function error

this is my function:

    <xsl:function name="foo:mytest">
    <xsl: param name="tet"/>
        <xsl:value-of select="$tet"/>
    </xsl:function>
and in the top of the document I defined an xmlns:foo="http://something"
in my template only thing I do is:
<xsl:value-of select="foo:mytest(14)"/> and I get the error:

java.lang.NoSuchMethodException: For extension function, could not find method java.lang.Double.mytest([ExpressionContext,] ). So what am I doing wrong??


 
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