# Web extensions noob - getting: There was an error during installation: Extension is invalid

**URL:** <https://discourse.mozilla.org/t/web-extensions-noob-getting-there-was-an-error-during-installation-extension-is-invalid/12828>\
**Category:** Add-on Support\
**Created:** [January 5, 2017, 8:17pm UTC](https://discourse.mozilla.org/t/web-extensions-noob-getting-there-was-an-error-during-installation-extension-is-invalid/12828 "2017-01-05T20:17:50Z")\
**Posts on this page:** 1\
**Showing post:** 15

<div class="post-metadata">

**Author:** ![lawson](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/lawson/32/23544_2.png) [@lawson](https://discourse.mozilla.org/u/lawson)\
**Post date:** [March 21, 2018, 4:00pm UTC](https://discourse.mozilla.org/t/web-extensions-noob-getting-there-was-an-error-during-installation-extension-is-invalid/12828/15 "2018-03-21T16:00:39Z")

</div>

I was also getting the vague “There was an error during installation: Extension is invalid” message and couldn’t pin it down.

I fixed it by **changing manifest version to 2** after looking at this article: [There was an error during installation: Extension is invalid](https://discourse.mozilla.org/t/there-was-an-error-during-installation-extension-is-invalid/24862).

None of the error messages mention this, but it seems pretty straightforward to catch and specify.

---

_[View the full topic](https://discourse.mozilla.org/t/web-extensions-noob-getting-there-was-an-error-during-installation-extension-is-invalid/12828)._