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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)	at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1123)