# Need help on running playground.Test

**URL:** <https://forum.inductiveautomation.com/t/need-help-on-running-playground-test/2520>\
**Category:** Module Development\
**Created:** [January 18, 2011, 2:19am UTC](https://forum.inductiveautomation.com/t/need-help-on-running-playground-test/2520 "2011-01-18T02:19:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TacHuynh](https://avatars.discourse-cdn.com/v4/letter/t/e495f1/32.png) [@TacHuynh](https://forum.inductiveautomation.com/u/TacHuynh)\
**Post date:** [January 18, 2011, 2:19am UTC](https://forum.inductiveautomation.com/t/need-help-on-running-playground-test/2520/1 "2011-01-18T02:19:51Z")

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Successful build and installed the WeatherModule but when trying to run playground.Test I got the error:

java.lang.NoClassDefFoundError: playground/Test  
Caused by: java.lang.ClassNotFoundException: playground.Test  
at java.net.URLClassLoader$1.run(Unknown Source)  
at java.security.AccessController.doPrivileged(Native Method)  
at java.net.URLClassLoader.findClass(Unknown Source)  
at java.lang.ClassLoader.loadClass(Unknown Source)  
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)  
at java.lang.ClassLoader.loadClass(Unknown Source)  
Exception in thread “main”

Need help!  
Thanks,  
Tac.

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<div class="post-metadata">

**Author:** ![TacHuynh](https://avatars.discourse-cdn.com/v4/letter/t/e495f1/32.png) [@TacHuynh](https://forum.inductiveautomation.com/u/TacHuynh)\
**Post date:** [January 18, 2011, 8:21am UTC](https://forum.inductiveautomation.com/t/need-help-on-running-playground-test/2520/2 "2011-01-18T08:21:16Z")

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I unrar the downloaded zip file to eclipse workspace and import to project.  
Before, I just copied the example directory to workspace and import.  
This fix the problem that I have for this playground.Test