java.lang.NullPointerException: Attempt to invoke virtual method 'boolean org.apache.xalan.extensions.ExtensionsTable.functionAvailable(java.lang.String, java.lang.String)' on a null object reference

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Attempt to invoke virtual method 'boolean org.apache.xalan.extensions.ExtensionsTable.functionAvailable(java.lang.String, java.lang.String)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean org.apache.xalan.extensions.ExtensionsTable.functionAvailable(java.lang.String, java.lang.String)' on a null object reference
at org.apache.xalan.transformer.TransformerImpl.functionAvailable(TransformerImpl.java:396)
at org.apache.xpath.functions.FuncExtFunctionAvailable.execute(FuncExtFunctionAvailable.java:89)
at org.apache.xpath.Expression.bool(Expression.java:186)
at org.apache.xpath.XPath.bool(XPath.java:412)
at org.apache.xalan.templates.ElemChoose.execute(ElemChoose.java:103)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2223)
at org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:389)
at org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.java:241)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2223)
at org.apache.xalan.transformer.TransformerImpl.transformToRTF(TransformerImpl.java:1830)
at org.apache.xalan.transformer.TransformerImpl.transformToRTF(TransformerImpl.java:1752)
at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:302)
at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:245)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2223)
at org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:389)
at org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.java:241)
at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:370)
at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:175)
at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:370)
at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:175)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2223)
at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2096)
at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1228)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:614)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1145)

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