--- title: A lesson or assessment shows an error, or its video won't play description: If a lesson shows an error or won't load, try these in order. --- [Skip to content](https://support.orilearning.com/knowledge/lesson-shows-an-error#main-content) [![logo (1)-1](https://support.orilearning.com/hs-fs/hubfs/logo%20(1)-1.png?width=100&height=95&name=logo%20(1)-1.png)](https://orilearning.com/) - [Contact Us](https://support.orilearning.com/open-a-support-ticket) - [Ori Learning Website](https://orilearning.com/) Open main navigation Close main navigation - [Contact Us](https://support.orilearning.com/open-a-support-ticket) - [Ori Learning Website](https://orilearning.com/) - [Contact us](https://support.orilearning.com/open-a-support-ticket) [Contact us](https://support.orilearning.com/open-a-support-ticket?hsLang=en) How can we help? - There are no suggestions because the search field is empty. 1. [Help Center](https://support.orilearning.com/knowledge?hsLang=en) 2. [Help & troubleshooting](https://support.orilearning.com/knowledge/help-troubleshooting?hsLang=en) 3. [Loading & device problems](https://support.orilearning.com/knowledge/help-troubleshooting?hsLang=en#loading-device-problems) # A lesson or assessment shows an error, or its video won't play If a lesson shows an error or won't load, try these in order. **For:** teachers and students ### Reopen the lesson, then hard-refresh and clear your cache 1. Try opening the lesson again. 2. If it still shows an error, close your browser and open a new tab. 3. Open the lesson and do a hard refresh: Ctrl + F5 on Windows, Command + Shift + R on Mac. 4. If it still fails, clear your browser's cache. ### If 'Preview' shows 'Oops, something unexpected went wrong' If 'Preview' shows **Oops, something unexpected went wrong**, the problem is with that lesson's content, not your account. Send us a request with the course and lesson name. ### If a lesson video won't play at school If a lesson video plays at home but not at school, the school network may be blocking it. Ask your district IT team to allow the sites it comes from, such as YouTube, Khan Academy and TED. More in [Allowlist Ori's websites and email senders](https://support.orilearning.com/knowledge/allowlist-ori?hsLang=en). ### If it still shows an error Report it with the details below. For what else to send, and how to check whether Ori is down, see [Report a bug, or check whether Ori is down](https://support.orilearning.com/knowledge/report-a-bug-or-outage?hsLang=en). ### Still need help? 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