An error occurred while generating the contract from a data

Dear Bonitasoft: I am a very new user to this software. I am running Bonitasoft Community 2021.2 on Windows 10. I am working through the getting started tutorial and in the section where one declares contracts. I have followed the directions up to Execution > Contracts > Add from data. A pop window comes up "Select claim attributes to add to contract" wherein I select "description" only and when I click on finish I get the error "An error while generating the contract from a data" appears. The details of the error are below. Any help you can offer would be greatly appreciated. Thank you.

• An error occurred while generating the contract from a data.
  org.bonitasoft.studio.groovy.GroovyCompilationUnitFactory.newCompilationUnit(GroovyCompilationUnitFactory.java:43)
  org.bonitasoft.studio.contract.core.mapping.expression.FieldToContractInputMappingExpressionBuilder.groovyCompilationUnit(FieldToContractInputMappingExpressionBuilder.java:130)
  org.bonitasoft.studio.contract.core.mapping.expression.FieldToContractInputMappingExpressionBuilder.addScriptDependencies(FieldToContractInputMappingExpressionBuilder.java:106)
  org.bonitasoft.studio.contract.core.mapping.expression.FieldToContractInputMappingExpressionBuilder.toExpression(FieldToContractInputMappingExpressionBuilder.java:72)
  org.bonitasoft.studio.contract.core.mapping.expression.FieldToContractInputMappingExpressionBuilder.toExpression(FieldToContractInputMappingExpressionBuilder.java:62)
  org.bonitasoft.studio.contract.core.mapping.RootContractInputGenerator.buildInitialValueExpression(RootContractInputGenerator.java:85)
  org.bonitasoft.studio.contract.core.mapping.RootContractInputGenerator.buildForInstanciation(RootContractInputGenerator.java:69)
  org.bonitasoft.studio.contract.ui.wizard.ContractInputGenerationWizard.lambda$0(ContractInputGenerationWizard.java:229)
  org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)