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RangeError: WebAssembly.instantiate(): Out of memory

Exact error

RangeError: WebAssembly.instantiate(): Out of memory: Cannot allocate Wasm memory for new instance

What it means

Bolt (and StackBlitz) run your project in a WebContainer inside the browser. The browser ran out of memory for WebAssembly, so the preview/runtime cannot start or crashed.

Likely causes

• Too many Bolt or StackBlitz tabs/projects open at once.
• Heavy browser extensions or other memory-hungry tabs.
• A large project or many concurrent embeds on one page.

How to fix it

1. Close other Bolt/StackBlitz tabs and unused browser tabs, then hard-refresh the project (Cmd/Ctrl+Shift+R).

2. Restart the browser or device if the error persists, to release cached memory.

3. Prefer Chrome or another Chromium browser; temporarily disable ad blockers/extensions or try Guest mode if WebContainer still fails to start.

4. If the preview is blank for a code bug instead of OOM, copy the terminal/console error into Bolt chat — see Bolt's preview troubleshooting docs.

Prevent this next time

• Connect the project to GitHub so every AI edit is versioned and reversible.
• Run `npm run build` locally or in CI before deploying an exported project.

Related errors

• Failed to parse source for import analysis because the content contains invalid JS syntax
• Lovable app shows a blank white page after deploying elsewhere
• Too many re-renders. React limits the number of renders to prevent an infinite loop