# Processing "GUI Builder warning" when opening G4P GUI builder

**URL:** <https://discourse.processing.org/t/processing-gui-builder-warning-when-opening-g4p-gui-builder/26980>\
**Category:** Libraries\
**Tags:** homework\
**Created:** [January 11, 2021, 4:40pm UTC](https://discourse.processing.org/t/processing-gui-builder-warning-when-opening-g4p-gui-builder/26980 "2021-01-11T16:40:33Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![JackjDaly](https://avatars.discourse-cdn.com/v4/letter/j/c0e974/32.png) [@JackjDaly](https://discourse.processing.org/u/JackjDaly)\
**Post date:** [January 11, 2021, 4:40pm UTC](https://discourse.processing.org/t/processing-gui-builder-warning-when-opening-g4p-gui-builder/26980/1 "2021-01-11T16:40:34Z")

</div>

Hi,

I am having an issue with using G4P in processing, I have tried adding it through the add tools feature in processing, as well as installing it by adding it to the tools folder as instructed here ([Quarks Place](http://www.lagers.org.uk/g4ptool/install.html))  
Yet every time I try to run the tool on processing I get this error message:

 ![Screenshot 2021-01-11 163909](https://canada1.discourse-cdn.com/flex036/uploads/processingfoundation1/original/2X/e/ebdda8019ff86ca2f6629c7990278d2e9e722191.png)

Any help would be much apreciated.

---

<div class="post-metadata">

**Author:** ![quark](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/quark/32/26_2.png) [@quark](https://discourse.processing.org/u/quark)\
**Post date:** [January 11, 2021, 4:48pm UTC](https://discourse.processing.org/t/processing-gui-builder-warning-when-opening-g4p-gui-builder/26980/2 "2021-01-11T16:48:49Z")

</div>

Open Processing and from menus _ **Sketch \> Add Library \> Import Library** _ install G4P with the Contributions Manager.

G4P is a **library** that provides all the controls, and GUI Builder is a **tool** that provides a graphical interface for designing GUI interfaces that use G4P.

HTH

---

<div class="post-metadata">

**Author:** ![JackjDaly](https://avatars.discourse-cdn.com/v4/letter/j/c0e974/32.png) [@JackjDaly](https://discourse.processing.org/u/JackjDaly)\
**Post date:** [January 11, 2021, 4:54pm UTC](https://discourse.processing.org/t/processing-gui-builder-warning-when-opening-g4p-gui-builder/26980/3 "2021-01-11T16:54:55Z")

</div>

Thanks so much for the quick response.

ahh that makes sense, this has been very helpful and it works now.

Thanks again, you legend