java - When I run the command "mvn appengine:devserver" build failure in google Appengine? -

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I am trying to go through the simple tutorial of Google App Engine with Java: but when I go to MVN Appenzin Trying to run: Devserver command, I get this strange missing directory error: 

  [INFO] Scanning for projects ... [INFO] --------- ------- ------------------------------------------- ------- ------ [INFO] Reactor Build Order: [INFO] [INFO] Guest Book [INFO] Guestbook-War [INFO] Guestbook-ears [INFO] [INFO] Bill Using fear org.apache.maven.lifecycle.internal .builder.singlethreaded.SingleThreadedBuilder with a thread count of [INFO] [INFO] ------------------ -------------- ------------------------------------ ---- [INFO] Building Guestbook 1.0-SANPSHOT [INFO] ----------------------------------- -------------- ----------------------- [INFO] [INFO] & gt; & Gt; & Gt; Epgenine-Maven-Plugin: 1.9.0: Deverser (default-CLI) @ guestbook & gt; & Gt; & Gt; [INFO] [INFO] & lt; & Lt; & Lt; Epenzene-Maven-Plugin: 1.9.0: Deverser (default-CLI) @ Guestbook & lt; & Lt; & Lt; [INFO] [INFO] - Appenin-Maven-Plugin: 1.9.0: Devswerver (default-CLI) @ guestbook --- [INFO] [INFO] Google App Engine Java SDK - Running Development Server [INFO] [INFO ] ------------------------------------------------- ----------------------- [INFO] Reactor Summary: [INFO] [INFO] Guest Book ............. ........................... Failure [0.768 s] [info] Guest-war ........... ......................... SKIPPED [INFO] Guestbook-ear ................. ................... SKIPPED [INFO] -------------------------- - ----------------------------------------- [INFO] Build Failure [INFO] ---------------------------------------------- - ------------------------- [INFO] Ku Time: 1.507s [INFO] Finish: 2014-11-04 T 22: 56: 48 + 05: 30 [INFO] Last Memory: 9m / 158m [INFO] ----------- ------------------------- ------------------------- ----------- [ERROR] Failed to execute the target com.google.appengine: appengine -maven-plugin: 1.9.0: devserver (default-cli) on Project Guestbook: App de Rectorary exists Not: /home/e100086/gooru_OAuth/guestbook/target/guestbook-1.0-SNAPSHOT- & gt; [Help 1] [Error] [Error] To see the full stack traces of errors, re-run Maven with the -i switch [ERROR] To enable full debug logging, Maven, using the X switch, Run. [Error] [Error] For more information about errors and possible solutions, please read the following article: [Error] [Help1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException   
 
 
  mvn application: devserver  is expected to run on  Guestbook-ear  project folder looks like you're running it on the  guestbook  folder. 
 
 EDIT: A potential duplicate?

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