my first report is not able to run.. please help me. i have mention error below

net.sf.jasperreports.engine.JRException: Errors were encountered when compiling report expressions class file:
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
calculator_report1_1479814685364_290597: 164: expecting ')', found 'of' @ line 164, column 30.1 error
 
    at net.sf.jasperreports.compilers.JRGroovyCompiler.compileUnits(JRGroovyCompiler.java:113)
    at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:201)
    at net.sf.jasperreports.engine.JasperCompileManager.compile(JasperCompileManager.java:354)
    at net.sf.jasperreports.engine.JasperCompileManager.compileToFile(JasperCompileManager.java:270)
    at net.sf.jasperreports.engine.JasperCompileManager.compileReportToFile(JasperCompileManager.java:563)
    at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:528)
    at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)
    at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)
Caused by: org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
calculator_report1_1479814685364_290597: 164: expecting ')', found 'of' @ line 164, column 30.
1 error
 
    at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:302)
    at org.codehaus.groovy.control.ErrorCollector.addFatalError(ErrorCollector.java:149)
    at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:119)
    at org.codehaus.groovy.control.ErrorCollector.addError(ErrorCollector.java:131)
    at org.codehaus.groovy.control.SourceUnit.addError(SourceUnit.java:359)
    at org.codehaus.groovy.antlr.AntlrParserPlugin.transformCSTIntoAST(AntlrParserPlugin.java:141)
    at org.codehaus.groovy.antlr.AntlrParserPlugin.parseCST(AntlrParserPlugin.java:107)
    at org.codehaus.groovy.control.SourceUnit.parse(SourceUnit.java:236)
    at org.codehaus.groovy.control.CompilationUnit$1.call(CompilationUnit.java:161)
    at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:900)
    at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:564)
    at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:540)
    at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:517)
    at net.sf.jasperreports.compilers.JRGroovyCompiler.compileUnits(JRGroovyCompiler.java:109)
    ... 7 more