Problema com classes Groovy no iRerport 3.7.0

Pessoal,

Quanto tento compilar um relatório no iReport 3.7.0, está aparecendo a seguinte mensagem de erro

Compiling to file... C:\UFPB\ProjetosDesenvolvimento\projeto_POSGRAD\PrpgRelatorio\src\java\ufpb\nti\ireport\jrxml\Alunos_Mat_Prog_Niv_Ano_Per.jasper
Errors compiling C:\UFPB\ProjetosDesenvolvimento\projeto_POSGRAD\PrpgRelatorio\src\java\ufpb\nti\ireport\jrxml\Alunos_Mat_Prog_Niv_Ano_Per.jasper!
Compilation exceptions: com.jaspersoft.ireport.designer.compiler.ErrorsCollector@2d4ea3  net.sf.jasperreports.engine.JRException: Too many groovy classes were generated. Please make sure that you don't use Groovy features such as closures that are not supported by this report compiler.      at net.sf.jasperreports.compilers.JRGroovyCompiler.compileUnits(JRGroovyCompiler.java:100)     at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:188)     at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:215)     at net.sf.jasperreports.engine.JasperCompileManager.compileReportToFile(JasperCompileManager.java:131)     at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:510)     at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)     at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)

Alguém tem alguma idéia do que pode estar acontecendo e poderia me ajudar a resolver este problema ?
Agradece,

Max Carvalho