title: How to fix [ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core'
body: <p>I want to start a Web Development project with GWT in Eclipse. For that I am following the tutorial on <a href="http://www.gwtproject.org/doc/latest/tutorial/create.html" rel="noreferrer">http://www.gwtproject.org/doc/latest/tutorial/create.html</a></p>
  
  <p>The form to create the Project does not exactly look like they explain. For example I cannot make a checkmark at "Use Google App Engine" since it does not exist. To get the build.xml I checkmarked the "Generate an Ant Project" field.</p>
  
  <p>When I try to run the generated code, the following error occurs:</p>
  
  <pre><code>Turning off precompile in incremental mode.
  Super Dev Mode starting up
  workDir: /tmp/gwt-codeserver-9585554490549923267.tmp
  2019-02-03 18:36:10.619:INFO::main: Logging initialized @879ms
  Loading Java files in com.google.gwt.sample.stockwatcher.StockWatcher.
  [ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core'      either directly or indirectly (most often by inheriting module 'com.google.gwt.user.User')
  </code></pre>
  
  <p>When I try to use the command line version of their tutorial, I get an 503 Error:</p>
  
  <pre><code>HTTP ERROR: 503
  
  Problem accessing /StockWatcher.html. Reason:
  
      Service Unavailable
  
  Powered by Jetty://
  </code></pre>
  
  <p>I use GWT SDK 2.8.1 and Java 10</p>
  
  <p>I installed already lots of plugins for Eclipse, so that I am quite sure to have all plugins I need. Maybe this could be something with the Java version? Does anyone has an idea?</p>