title: Liferay: can't deploy module. Unresolved requirement: Require-Capability: osgi.ee; filter:="(osgi.ee=UNKNOWN)"
body: <p>I recently started Liferay development and I'm following the official developer guide, but I'm having trouble when trying to deploy a simple hello world module. </p>
  
  <p>When I try to deploy the module, Eclipse console shows the following exception:</p>
  
  <blockquote>
    <p>org.osgi.framework.BundleException: Could not resolve module:
    com.liferay.docs.guestbook.portlet [1000]_  Unresolved requirement:
    Require-Capability: osgi.ee; filter:="(osgi.ee=UNKNOWN)"_ [Sanitized]</p>
  </blockquote>
  
  <p>I'm stuck at this point, and don't know what to do. I tried using different Eclipse versions, I tried changing projects' Java build path to use JRE 1.8, I tried deleting the project and creating a new one... </p>
  
  <p>I also used the command "ss" to list the modules, but apparently my module isn't listed.</p>
  
  <p>I'm under Ubuntu 18.04 and using Eclipse 2018-12 build.</p>
  
  <p>Thank you.</p>