如何修复无法解析对JvmType＆＃39; Generator＆＃39;的引用？在Xtext中

Question

在MWE2中运行我的生成器配置时，收到以下错误消息：

  

无法解析对JvmType的引用   ＆＃39;发电机＆＃39; ...

module org.xtext.example.MyDsl 
import org.eclipse.emf.mwe.utils.*
import org.eclipse.xtext.generator.*
import org.eclipse.xtext.ui.generator.*

var grammarURI = "classpath:/org/xtext/example/MyDsl.xtext"
var file.extensions = "mydsl"
var projectName = "org.xtext.example.mydsl"
var runtimeProject = "../${projectName}"

Workflow {
  bean = StandaloneSetup {
    platformUri = "${runtimeProject}/.."
  }
  component = DirectoryCleaner {
    directory = "${runtimeProject}/src-gen"
  }
  component = DirectoryCleaner {
    directory = "${runtimeProject}.ui/src-gen"
  }
  component = Generator {
    pathRtProject = runtimeProject
    pathUiProject = "${runtimeProject}.ui"
    projectNameRt = projectName
    projectNameUi = "${projectName}.ui"    
    language = {
      uri = grammarURI
      fileExtensions = file.extensions
      fragment = grammarAccess.GrammarAccessFragment {}

    }
  }
}

我该如何解决？