# Sveltekit project: error with slice-machine + error 500 on draft previews **URL:** \ **Category:** Developing with Prismic\ **Tags:** svelte, slice-machine\ **Created:** [January 17, 2024, 8:29pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000 "2024-01-17T20:29:08Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![paul6](https://dub1.discourse-cdn.com/flex013/user_avatar/community.prismic.io/paul6/32/5691_2.png) [@paul6](https://community.prismic.io/u/paul6)\ **Post date:** [January 17, 2024, 8:29pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000/1 "2024-01-17T20:29:09Z")
Hi everyone, I really looked everywhere before posting but I didn't find a solution to my problems. I built a project with Prismic minimal starter kit for sveltekit and I'm hosting the project on Vercel. My problem today is that I don't get the slices previews for a page, I first get a glimpse of it then it goes blank and at some point I get an "error" text in red. Also when I try to preview the page i works well on published pages but not for a draft. Maybe it's all connected... I'll continue to look for an answer and make sure to update you guys here if I found any but I also hope someone can help me with this. Feel free to ask me if you need anything. Thanks a lot in advance Paul ---
**Author:** ![paul6](https://dub1.discourse-cdn.com/flex013/user_avatar/community.prismic.io/paul6/32/5691_2.png) [@paul6](https://community.prismic.io/u/paul6)\ **Post date:** [January 17, 2024, 9:32pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000/2 "2024-01-17T21:32:40Z")
Ok some update here: I found out that if I empty the cache of Chrome I can then get back my slice previews on the page builder. But when I preview the page and I come back to the page builder, then the slice previews are not working anymore. ---
**Author:** ![samlittlefair](https://dub1.discourse-cdn.com/flex013/user_avatar/community.prismic.io/samlittlefair/32/696_2.png) [@samlittlefair](https://community.prismic.io/u/samlittlefair)\ **Post date:** [January 18, 2024, 1:02pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000/4 "2024-01-18T13:02:46Z")
Thanks for raising this @paul6. I'm going to try to recreate it myself. Is there anything I should know about your implementation — any libraries or third-party integrations that you're using? What hosting provider are you using to deploy your site? Sam ---
**Author:** ![paul6](https://dub1.discourse-cdn.com/flex013/user_avatar/community.prismic.io/paul6/32/5691_2.png) [@paul6](https://community.prismic.io/u/paul6)\ **Post date:** [January 18, 2024, 1:31pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000/5 "2024-01-18T13:31:18Z")
Hi @samlittlefair and thanks for your message. I'm using Vercel and TailwindCSS and I didn't try anything particularly complicated for this. I just made a fork of the repo for you if you want to try it yourself (if you don't find it in the [read.me](http://read.me) I'll be happy to help you with anything you might need): [https://github.com/paulduhard/gwenaelle-lepeltier](https://github.com/paulduhard/gwenaelle-lepeltier) I followed your youtube tutorial to create this website so you should feel very confortable with it 🙂 Paul ---
**Author:** ![paul6](https://dub1.discourse-cdn.com/flex013/user_avatar/community.prismic.io/paul6/32/5691_2.png) [@paul6](https://community.prismic.io/u/paul6)\ **Post date:** [January 18, 2024, 1:40pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000/6 "2024-01-18T13:40:47Z")
Ok, I found something interesting that might help you in your investigation... By default my browser has third-party cookies allowed and the slices previews won't work but I just switched to blocked and the slices work as intended. I hope it helps you more than me 😅 ---
**Author:** ![samlittlefair](https://dub1.discourse-cdn.com/flex013/user_avatar/community.prismic.io/samlittlefair/32/696_2.png) [@samlittlefair](https://community.prismic.io/u/samlittlefair)\ **Post date:** [January 19, 2024, 3:42pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000/7 "2024-01-19T15:42:03Z")
Hey @paul6, Thanks for the details, and I'm glad the tutorial was (at least a little helpful)! I'll spend some time debugging this on Monday and get back to you. Sam ---
**Author:** ![samlittlefair](https://dub1.discourse-cdn.com/flex013/user_avatar/community.prismic.io/samlittlefair/32/696_2.png) [@samlittlefair](https://community.prismic.io/u/samlittlefair)\ **Post date:** [February 16, 2024, 2:06pm UTC](https://community.prismic.io/t/sveltekit-project-error-with-slice-machine-error-500-on-draft-previews/15000/8 "2024-02-16T14:06:33Z")
Hey @paul6, I'm very sorry - I lost track of this thread. Are you still having this error? Sam