# Project creation error

**URL:** <https://discourse.processing.org/t/project-creation-error/4660>\
**Category:** Processing\
**Created:** [October 19, 2018, 9:41pm UTC](https://discourse.processing.org/t/project-creation-error/4660 "2018-10-19T21:41:25Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ThatRetroGuy](https://avatars.discourse-cdn.com/v4/letter/t/d07c76/32.png) [@ThatRetroGuy](https://discourse.processing.org/u/ThatRetroGuy)\
**Post date:** [October 19, 2018, 9:41pm UTC](https://discourse.processing.org/t/project-creation-error/4660/1 "2018-10-19T21:41:25Z")

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![27%20PM](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/6/6176b517bd2600dc91a94f11f9052de0e3c0f224.png)  
Hi I’m trying to create a new processing eclipse project. This error message appears and ive tried using multiple other files. The error never goes away or simply changes to (file) does not contain processing libs. Could any of you help me? I’m on mac btw.

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**Author:** ![jeremydouglass](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/jeremydouglass/32/20_2.png) [@jeremydouglass](https://discourse.processing.org/u/jeremydouglass)\
**Post date:** [October 23, 2018, 10:07pm UTC](https://discourse.processing.org/t/project-creation-error/4660/2 "2018-10-23T22:07:02Z")

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You might want to point to the core.jar – the Java library – not the .app, which is a special folder that contains all the parts of the PDE application, including that jar.

> The `core.jar` file contains the core classes of Processing and has to be part of your classpath when building a Library. On Windows and Linux, this file is located in the Processing distribution folder inside a folder named `lib` . On Mac OS X, right-click the Processing.app and use “Show Package Contents” to see the guts. The `core.jar` file is inside Contents → Resources → Java. For further information about the classes in `core.jar` , you can see the source [here](http://code.google.com/p/processing/source/browse/trunk/processing#processing/core) and the developer documentation [here](http://processing.googlecode.com/svn/trunk/processing/build/javadoc/core/index.html).

You could also just follow the entire instruction list for creating a new library project from the template.

> **[GitHub - processing/processing-library-template: Processing Library Template...](https://github.com/processing/processing-library-template)**
>
> Processing Library Template for Eclipse. Contribute to processing/processing-library-template development by creating an account on GitHub.