# Game control plus with ClassNotFoundException problem

**URL:** <https://discourse.processing.org/t/game-control-plus-with-classnotfoundexception-problem/17963>\
**Category:** Libraries\
**Tags:** homework\
**Created:** [February 21, 2020, 3:02am UTC](https://discourse.processing.org/t/game-control-plus-with-classnotfoundexception-problem/17963 "2020-02-21T03:02:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![JeremyL](https://avatars.discourse-cdn.com/v4/letter/j/b5a626/32.png) [@JeremyL](https://discourse.processing.org/u/JeremyL)\
**Post date:** [February 21, 2020, 3:02am UTC](https://discourse.processing.org/t/game-control-plus-with-classnotfoundexception-problem/17963/1 "2020-02-21T03:02:41Z")

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Hi,@quark sorry to bother you. im new to using processing for my school project, and now I’m learning to use game control plus library. However when I test it, whatever which example I test, everytime it will show ClassNotFoundException: org.gamecontrolplus.ControlIO. Are there any problems with this library?

thankyou

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**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:** [February 21, 2020, 8:46am UTC](https://discourse.processing.org/t/game-control-plus-with-classnotfoundexception-problem/17963/2 "2020-02-21T08:46:54Z")

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This is not a problem with GCP library itself sounds like a bad installation. Make sure you are using the latest version of Processing aand install GCP through the Contributions manager.

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**Author:** ![JeremyL](https://avatars.discourse-cdn.com/v4/letter/j/b5a626/32.png) [@JeremyL](https://discourse.processing.org/u/JeremyL)\
**Post date:** [February 23, 2020, 6:26am UTC](https://discourse.processing.org/t/game-control-plus-with-classnotfoundexception-problem/17963/3 "2020-02-23T06:26:19Z")

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I updated my processing and also tried different ways to install it but still got the same information…

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**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:** [February 23, 2020, 8:45am UTC](https://discourse.processing.org/t/game-control-plus-with-classnotfoundexception-problem/17963/4 "2020-02-23T08:45:50Z")

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Try the `Gcp_ShowDevices` example that comes with the library.