Help to resolve this Error

I am a newbie, but I am trying to work on the project, which already done half part and left in middle.
on the NetBeans, When I click on run, Application is connecting to database and then login window appears, but when i give login details, it's giving this error. Can anyone help me what is this error, where I am doing mistake? Thanks in advance.
Samson.
Exception in thread "AWT-EventQueue-0" java.lang.NoSuchMethodError: org.apache.commons.collections.IteratorUtils.singletonIterator(Ljava/lang/Object;)Lorg/apache/commons/collections/ResettableIterator;
at org.objectstyle.cayenne.map.ObjAttribute.getDbPathIterator(ObjAttribute.java:209)
at org.objectstyle.cayenne.access.trans.SelectTranslator.appendQueryColumns(SelectTranslator.java:395)
at org.objectstyle.cayenne.access.trans.SelectTranslator.buildResultColumns(SelectTranslator.java:358)
at org.objectstyle.cayenne.access.trans.SelectTranslator.createSqlString(SelectTranslator.java:146)
at org.objectstyle.cayenne.access.trans.QueryAssembler.createStatement(QueryAssembler.java:131)
at org.objectstyle.cayenne.access.jdbc.SelectAction.performAction(SelectAction.java:104)
at org.objectstyle.cayenne.access.DataNodeQueryAction.runQuery(DataNodeQueryAction.java:95)
at org.objectstyle.cayenne.access.DataNode.performQueries(DataNode.java:310)
at org.objectstyle.cayenne.access.DataDomain.performQuery(DataDomain.java:787)
at org.objectstyle.cayenne.access.DataDomain.performQueries(DataDomain.java:621)
at org.objectstyle.cayenne.access.DataContext.performQueries(DataContext.java:1091)
at org.objectstyle.cayenne.access.Transaction.performQueries(Transaction.java:184)
at org.objectstyle.cayenne.access.DataContext.performQueries(DataContext.java:1049)
at org.objectstyle.cayenne.access.DataContextSelectAction.performQuery(DataContextSelectAction.java:153)
at org.objectstyle.cayenne.access.DataContextSelectAction.performQuery(DataContextSelectAction.java:85)
at org.objectstyle.cayenne.access.DataContext.performQuery(DataContext.java:1178)

It's a fair while since I used NetBeans, so my memory of the exact commands and where they sit on the menu bar is a bit rusty, but you can certainly compile more than one file at a time, using "Build".
Build will recompile all classes for which the source file has been been modified since it was last compiled or for which there is no corresponding bytecode (.class) file.
So, to force everything to be recompiled you will need to remove all of the .class files from your project using the "Clean" option. (I think it is on the same menu-bar item at Build.) Then, doing a build will recompile everything.

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