title: "Plugin not found for prefix app engine" when using maven
body: <p>I am trying to run the command</p>
  
  <pre><code>mvn appengine:devserver
  </code></pre>
  
  <p>but it throws the following error</p>
  
  <pre><code>[ERROR] No plugin found for prefix 'appengine' in the current project and in the plugin groups 
   [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local 
   (/Users/tylerrice/.m2/repository), central (https://repo.maven.apache.org/maven2)] -&gt; [Help 1]
  </code></pre>
  
  <p>I have never used maven before all this code is from a development company we hired to write the majority of the backend so I am completely lost here. I visited the help page for this error <a href="http://cwiki.apache.org/confluence/display/MAVEN/NoPluginFoundForPrefixException">here</a> . I went through the list there and I can't find a pom.xml file either</p>