[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Build error deploying a Svelte project to Prod (Preview builds fine) 252 views · 11 likes · 16 posts BMG (@elterman) · 2025-03-13 error during build: ```txt Error: Could not resolve peer dependency "svelte/compiler" relative to your project — please install it and try again. at resolve_peer_dependency (file:///vercel/path0/node_modules/@sveltejs/kit/src/utils/import.js:20:10) at async file:///vercel/path0/node_modules/@sveltejs/kit/src/core/sync/utils.js:7:21 Error: Command "npm run build" exited with 1 ``` Used to work fine. Cannot understand what changed. The AI assistant says the error is unexpected. Amy Egan (@amyegan) · 2025-03-13 It looks like there's a missing dependency, but I don't know enough about your project to say why that's happening. Do you have a public repo or a [minimal reproducible example](https://vercel.com/guides/creating-a-minimal-reproducible-example) that I can use to help you debug? BMG (@elterman) · 2025-03-14 · ♥ 1 Thank you, Amy. The public repo is at https://github.com/elterman/Worded-Well. Preview builds and deploys fine, and the local build runs without an issue as well. The problem is with the Prod build. It started happening today after a totally innocent code change. Thank you for looking into it. EDIT: Well, now Preview build fails as well, same error. EDIT2: Seems to be working now. BTW, I created a new project linked to the same repo, deployment worked at first, then stopped working, now it's working again – in both projects. Go figure. Amy Egan (@amyegan) · 2025-03-14 · ♥ 1 Please let me know if deployments stop working again. I hope they're all good now! BMG (@elterman) · 2025-03-14 They intermittently fail, especially when run from the CLI (but not only). But I found that if I request "Redeploy" from the website, it usually works. Paul Sammut (@paulesammut) · 2025-03-15 Having exactly the same problem. It started yesterday. It deploys successfully 2 or 3 times before starting to fail, even without code changes. Deleting the project and recreating it by running vercel on the command line seems to "reset" it, i.e. it deploys successfully 2 or 3 times again, then starts to fail. Just tried again now after 20 or so hours and it again repeated that process - a couple of successful deployments, now failing again. The svelte/compiler dependency cannot be installed manually, it is part of svelte itself. Hitting the redeploy button in the UI succeeds, which I guess is the workaround for now. EDIT: Actually, it's intermittent Eric Jarvis (@jarvisworks) · 2025-03-16 · ♥ 2 elterman & Paul, thanks for the tip about redeploying via the ui. I was able to get a successful build for the first time in days by redeploying. Amy Egan (@amyegan) · 2025-03-17 Do you all get the same `Could not resolve peer dependency "svelte/compiler"` error every time? BMG (@elterman) · 2025-03-17 I do get the same error every time. Amy Egan (@amyegan) · 2025-03-17 · ♥ 1 I was finally able to repro using @elterman's repo (thanks for sharing it). I could only make it happen on a preview deployment from GitHub. The fact that it tends to work after a redeploy made me think it could be a build cache issue, but it seems to work even if I redeploy with the original build cache :confused: Tried to [disable the build cache](https://vercel.com/docs/deployments/troubleshoot-a-build#managing-build-cache) anyway, and I couldn't make the error happen again after that. Tried to re-enable the build cache and got errors again right away. But it doesn't happen every time so that could just be a coincidence. Deploying from local with the CLI also didn't run into errors any of the times I tried it. So possible workarounds include disabling the build cache (add env var `VERCEL_FORCE_NO_BUILD_CACHE=1`) or using CLI to deploy. I'm sharing all of this with the internal team so we can dig into the root cause, but I wanted to at least give you a workaround so you don't keep seeing build errors BMG (@elterman) · 2025-03-17 Thank you, Amy. I just tried to deploy Preview from the CLI, got the error. Haven't tried disabling the cache yet. Paul Sammut (@paulesammut) · 2025-03-17 YES. Always same error. And it is still happening frequently, i.e. around 50% of the time for me. Has not once failed on redeploy from UI though. Will try disable the cache when my too many deploys breach times out ;) Paul Sammut (@paulesammut) · 2025-03-17 · ♥ 2 Thanks Amy! Workaround VERCEL_FORCE_NO_BUILD_CACHE-1 works! BMG (@elterman) · 2025-03-17 · ♥ 2 Indeed it does. Thank you, Amy. Amy Egan (@amyegan) · 2025-03-19 · ♥ 1 We shipped a build cache update related to this issue. If you re-enable build cache and give it a try, please let me know whether or not the dependency error happens again. Everything should be working normally now. BMG (@elterman) · 2025-03-19 · ♥ 1 It does work. Both Preview and Production. Thank you!