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I'm trying run three filter functions(Recode,Categorize,Interpolate) described at the bottom of this page http://docs.geoserver.org/stable/en/user/filter/function_reference.html

Recode and Interpolate works fine but Categorize throws me the following exception message. 'java.lang.RuntimeException: Unable to find function Categorize'

What could cause this problem ? Am I supposed to install a plugin on geoserver or what?

The official examples are on http://docs.geoserver.org/stable/en/user/styling/sld-tipstricks/transformation-func.html

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what does the log file say? – iant♦ Feb 7 at 8:15
@iant it says java.lang.RuntimeException: Unable to find function Categorize at org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:104) at org.geotools.filter.FunctionFinder.findFunction(FunctionFinder.java:70) at org.geotools.filter.FilterFactoryImpl.function(FilterFactoryImpl.java:470) at org.geotools.filter.ExpressionDOMParser.expression(ExpressionDOMParser.java:394) at org.geotools.filter.ExpressionDOMParser.parseExpression(ExpressionDOMParser.java‌​:102) – ademozay Feb 7 at 12:53

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