# App rebuild hangs
**URL:** https://meta.discourse.org/t/app-rebuild-hangs/300757
**Category:** Self-hosting
**Created:** [March 24, 2024, 11:33pm UTC](https://meta.discourse.org/t/app-rebuild-hangs/300757 "2024-03-24T23:33:08Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@agf1997](https://meta.discourse.org/u/agf1997)
#### Post date: [March 24, 2024, 11:33pm UTC](https://meta.discourse.org/t/app-rebuild-hangs/300757/1 "2024-03-24T23:33:08Z")
I’m having an issue where I tried upgrading, ran into an issue, then tried rebuilding the app with
`./launcher rebuild app`
The rebuild is hanging at:
```plaintext
I, [2024-03-24T22:32:01.280882 #1] INFO -- : > cd /var/www/discourse && su discourse -c 'bundle exec rake themes:update assets:precompile'
Node.js heap_size_limit (1006.0) is less than 2048MB. Setting --max-old-space-size=2048.
```
Also tried `discourse-doctor` but did the same thing
---
### Author:  [@omarfilip](https://meta.discourse.org/u/omarfilip)
#### Post date: [March 25, 2024, 1:11am UTC](https://meta.discourse.org/t/app-rebuild-hangs/300757/2 "2024-03-25T01:11:46Z")
Sounds like the server is out of memory.
Search here for [heap\_size\_limit is less than 2048MB](https://meta.discourse.org/search?q=heap_size_limit%20is%20less%20than%202048MB%20order%3Alatest)
---
### Author:  [@pfaffman](https://meta.discourse.org/u/pfaffman)
#### Post date: [March 25, 2024, 12:23pm UTC](https://meta.discourse.org/t/app-rebuild-hangs/300757/3 "2024-03-25T12:23:00Z")
I see that message ask the time. I think it is not the problem. It is likely that memory is an issue though. How much ram and swap do you have? I think you need at least 4gb combined. A build with 1gb of ram can take upwards of 20 minutes these days.