AI & TechnologyLovable, Bolt and Replit Errors: 7 Fixes (2026)

Short answer: apps built with Lovable, Bolt or Replit break in three places: publishing and deploying, the connections to GitHub and secret keys, and the AI chat itself when it can’t fix a bug. Find your problem below; each one links to a full fix page checked against the builder’s own documentation.

Errors in AI-built apps are easiest to fix once you know whether the builder, the host or the code caused them. The 7 problems below stop apps built with Lovable, Bolt or Replit from going live, staying live or getting fixed. Facts come from the vendors’ own documentation, as checked on the linked fix page; the advice on what to do and in which order is App369’s.

Publish and deploy errors

These three problems appear when the app leaves the builder’s editor: a published Lovable site, a deploy to Netlify or Vercel, and a Replit deployment.

Lovable app works in the preview, but the published site is blank

The live site is a snapshot of your last publish, and the Lovable publishing docs say “later changes are not automatically pushed live”. Publish again, then read the browser console: an error in the app can stop it from drawing. If only your own domain is blank, check its DNS records. Full steps: Lovable blank page after publish.

The app works in Bolt or Lovable, but the deploy build fails

The build machine is missing something your laptop has. Set the VITE_ variables on the host, match its Node.js version to yours, and make every import match the file name’s exact case, since Netlify’s build machine treats Button.tsx and button.tsx as different files. Full steps: Bolt or Lovable build failed on Netlify or Vercel.

Uploaded files or saved data disappear after a Replit redeploy

Files the running app writes to its own folder live on the deployment’s file system, and Replit’s docs say not to rely on it. Move records into the database and uploads into object storage, and keep nothing you need only in memory. Full steps: Replit deployment lost files and data.

GitHub sync and secret key errors

These two problems come from what the builder connects to: the GitHub repository and the secret keys your server code reads.

Lovable project stopped syncing with GitHub

The Lovable GitHub docs say “Lovable only syncs one branch at a time, and that is the branch the project is currently set to”. If the status says diverged, copy any Lovable-only changes across before you push, because the push replaces Lovable’s version of the branch. Full steps: Lovable GitHub sync not working.

Lovable edge function can’t read the API key

The secret was skipped, its name doesn’t match the one the function reads, or the project was remixed. On remixes, the Lovable secrets docs say “Manually added secrets are not copied over, so re-enter them in the new project.” Never put a secret key in a VITE_ variable. Full steps: Lovable edge function secret missing.

When the AI can’t fix it

These two problems come from the builder’s chat: a bug the AI keeps failing to fix, and the tokens each attempt uses.

Lovable keeps breaking, and the AI can’t fix the same bug

Stop resending the request. Ask Lovable to investigate, roll back to the version before the bug, then follow its chat guide: “Switch to Plan mode and ask Lovable to outline an approach first.” In Bolt, clear the context; in Replit, start a fresh thread with a summary. Full steps: Lovable keeps breaking.

Bolt keeps running out of tokens

Bolt reads the project with each message, so larger projects use more tokens per message. Point it at the files that matter, and don’t press Attempt fix again and again. Bolt’s token efficiency guide notes “Clicking an on-screen button or action doesn’t use tokens, but prompting Bolt does.” Full steps: Bolt running out of tokens.

Which to check first

Where the app fails, in the builder’s preview, on the published site or on your own host, points to the cause. App369’s full order for an AI-built app that just broke:

1. Compare the preview with the published site, and publish again if they differ.
2. Open the browser console on the broken page and read the first error.
3. For a host such as Netlify or Vercel, read the build log and check the environment variables are set there.
4. Check the connections: GitHub sync status, secret names, the database.
5. If the AI has failed at the same bug more than once, roll back and stop spending credits on it.

Before launch, read is Lovable safe for a real app for the security checks. To ship a Lovable or Bolt web app as a phone app, see turning it into an App Store app.

Need a hand?

App369 fixes apps built with AI builders. If one bug is the whole problem, the App Fix Ticket covers it in two fixed-price steps: a $450 diagnosis that finds the root cause and gives you a fixed quote for the fix, then the fix itself. If more is going on, the AI-Built App Rescue starts with a Launch Check of the whole app. Or describe the problem and get a written quote.