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Exception when build openFire

Hi
I am trying to Build Openfire on eclipse but this exception happen
the version of Openfire is 4.2 and i followed this documentation


how can i fix this?

[java] java.lang.NullPointerException
** [java] at org.apache.tomcat.util.descriptor.tld.TldResourcePath.hashCode(TldResourcePath.java:156)**
** [java] at java.util.HashMap.hash(Unknown Source)**
** [java] at java.util.HashMap.get(Unknown Source)**
** [java] at org.apache.jasper.compiler.TldCache.getTaglibXml(TldCache.java:95)**
** [java] at org.apache.jasper.compiler.TagLibraryInfoImpl.(TagLibraryInfoImpl.java:179)**
** [java] at org.apache.jasper.compiler.Parser.parseTaglibDirective(Parser.java:411)**
** [java] at org.apache.jasper.compiler.Parser.parseDirective(Parser.java:469)**
** [java] at org.apache.jasper.compiler.Parser.parseElements(Parser.java:1428)**
** [java] at org.apache.jasper.compiler.Parser.parse(Parser.java:139)**
** [java] at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:227)**
** [java] at org.apache.jasper.compiler.ParserController.parse(ParserController.java:100)**
** [java] at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:199)**
** [java] at org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)**
** [java] at org.apache.jasper.JspC.processFile(JspC.java:1217)**
** [java] at org.apache.jasper.JspC.execute(JspC.java:1368)**
** [java] at org.apache.jasper.JspC.main(JspC.java:272)**
** [java] org.apache.jasper.JasperException: java.lang.NullPointerException**