# Add Extension - Server Error

**URL:** https://forum.shopware.com/t/add-extension-server-error/88600
**Category:** Installation / Getting Started (EN)
**Tags:** installation--gettin
**Created:** [24. Juni 2021 um 15:56 UTC](https://forum.shopware.com/t/add-extension-server-error/88600 "2021-06-24T15:56:08Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![shopware7](https://avatars.discourse-cdn.com/v4/letter/s/eb9ed0/32.png) [@shopware7](https://forum.shopware.com/u/shopware7)
#### Post date: [24. Juni 2021 um 15:56 UTC](https://forum.shopware.com/t/add-extension-server-error/88600/1 "2021-06-24T15:56:08Z")

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New install, during install I was able to add a couple of extensions; eg Paypal which is working but if I try to install any additional extensions from the store I get:

Argument 1 passed to Shopware\Core\Framework\Store\Struct\CartPositionCollection::\_\_construct() must be iterable, null given, called in /homepages/43/d416919653/htdocs/fab.prims.com/vendor/shopware/core/Framework/Store/Struct/CartStruct.php on line 44

Really not sure what to do about it. Other than jumping in to the code is there any configuration I can check first?