Ireport erro Cast String Boolean

Estou com um problema no Ireport 5.6.0 no Print When Expression tem o seguinte valor:

($F{terreno_imob_LOTE} == “”) ? $F{cad_imobiliario_INSCRICAO} : “”

na hora de executar o relatorio aparece o seguinte erro:

Error filling print… java.lang.String cannot be cast to java.lang.Boolean
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean at net.sf.jasperreports.engine.fill.JRFillElement.evaluatePrintWhenExpression(JRFillElement.java:795) at net.sf.jasperreports.engine.fill.JRFillTextField.evaluate(JRFillTextField.java:482) at net.sf.jasperreports.engine.fill.JRFillElementContainer.evaluate(JRFillElementContainer.java:259) at net.sf.jasperreports.engine.fill.JRFillBand.evaluate(JRFillBand.java:456) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnBand(JRVerticalFiller.java:2067) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:788) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:298) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:152) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:963) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:873) at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:87) at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:287) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:760) at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:891) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)
Print not filled. Try to use an EmptyDataSource…

No Ireport 4.0.2 funciona traquilo.