# Custom plugin not showing on UI after added to plugins folder

**URL:** <https://forum.mautic.org/t/custom-plugin-not-showing-on-ui-after-added-to-plugins-folder/11065>\
**Category:** Product Support\
**Created:** [September 4, 2019, 3:52pm UTC](https://forum.mautic.org/t/custom-plugin-not-showing-on-ui-after-added-to-plugins-folder/11065 "2019-09-04T15:52:17Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![aditya](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/aditya/32/494_2.png) [@aditya](https://forum.mautic.org/u/aditya)\
**Post date:** [September 7, 2019, 11:12am UTC](https://forum.mautic.org/t/custom-plugin-not-showing-on-ui-after-added-to-plugins-folder/11065/3 "2019-09-07T11:12:45Z")

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I have tried one of sample plugins and it seems to work and using that i have tried to create a sample plugin but i am getting an error. I have check the log and got below due which it seemed the plugin was not showing

mautic.CRITICAL: Uncaught PHP Exception InvalidArgumentException: “mautic.helloworld.model.contact is not a registered container key.” at /app/app/bundles/CoreBundle/Factory/ModelFactory.php line 58 {“exception”:"[object] (InvalidArgumentException(code: 0): mautic.helloworld.model.contact is not a registered container key. at /app/app/bundles/CoreBundle/Factory/ModelFactory.php:58)"}

In config i have set the following 🙂  
‘services’ =\> array(  
‘models’ =\> [  
‘mautic.helloworld.model.contact’ =\> [  
‘class’ =\> \MauticPlugin\MauticHelloWorldBundle\Model\ContactModel::class  
],  
],  
),

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