javax.xml.transform.TransformerException: Unknown error in XPath.

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Unknown error in XPath.
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javax.xml.transform.TransformerException: Unknown error in XPath.
at org.apache.xpath.XPath.bool(XPath.java:412)
at org.apache.xalan.templates.ElemIf.execute(ElemIf.java:208)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)
at org.apache.xalan.templates.ElemIf.execute(ElemIf.java:210)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)
at org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:435)
at org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.java:273)
at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:425)
at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:216)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)
at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)
at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:425)
at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:216)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)
at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2160)
at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1213)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:668)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1129)
at my.companies.product.validation.impl.MeldingValidationServiceSAXImpl.validate(MeldingValidationServiceSAXImpl.java:89)

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