groovy script not working

running on windows 10  PVM

Soap UI 5.7.0

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  rg.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed: Script1.groovy: 15: unable to resolve class org.apache.poi.xssf.usermodel.XSSFCell @ line 15, column 1. import org.apache.poi.xssf.usermodel.XSSFCell ^ org.codehaus.groovy.syntax.SyntaxException: unable to resolve class org.apache.poi.xssf.usermodel.XSSFCell @ line 15, column 1. at org.codehaus.groovy.ast.ClassCodeVisitorSupport.addError(ClassCodeVisitorSupport.java:262) at org.codehaus.groovy.control.ResolveVisitor.visitClass(ResolveVisitor.java:1437) at org.codehaus.groovy.control.ResolveVisitor.startResolving(ResolveVisitor.java:262) at org.codehaus.groovy.control.CompilationUnit.lambda$new$16(CompilationUnit.java:738) at org.codehaus.groovy.control.CompilationUnit$ISourceUnitOperation.doPhaseOperation(CompilationUnit.java:901) at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:627) at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:389) at groovy.lang.GroovyClassLoader.lambda$parseClass$3(GroovyClassLoader.java:332) at org.codehaus.groovy.runtime.memoize.StampedCommonCache.compute(StampedCommonCache.java:163) at org.codehaus.groovy.runtime.memoize.StampedCommonCache.getAndPut(StampedCommonCache.java:154) at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:330) at groovy.lang.GroovyShell.parseClass(GroovyShell.java:526) at groovy.lang.GroovyShell.parse(GroovyShell.java:538) at groovy.lang.GroovyShell.parse(GroovyShell.java:570) at groovy.lang.GroovyShell.parse(GroovyShell.java:565) at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.compile(SoapUIGroovyScriptEngine.java:136) at com.eviware.soapui.support.scripting.groovy.SoapUIGroovyScriptEngine.run(SoapUIGroovyScriptEngine.java:87) at com.eviware.soapui.impl.wsdl.teststeps.WsdlGroovyScriptTestStep.run(WsdlGroovyScriptTestStep.java:143) at com.eviware.soapui.impl.wsdl.panels.teststeps.GroovyScriptStepDesktopPanel$RunAction$1.run(GroovyScriptStepDesktopPanel.java:251) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at java.base/java.lang.Thread.run(Thread.java:831) Script1.groovy: 16: unable to resolve class org.apache.poi.xssf.usermodel.XSSFRow @ line 16, column 1. import org.apache.poi.xssf.usermodel.XSSFRow ^ org.codehaus.groovy.syntax.SyntaxException: unable to resolve class org.apache.poi.xssf.usermodel.XSSFRow @ line 16, column 1.