[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [v0](/c/v0/59) # v0 preview environment failure with package installation error 40 views · 0 likes · 5 posts Sakarin35 (@sakarin35) · 2026-02-24 Hello `v0` Support Team, I am experiencing a critical issue with my `v0` project preview environment. The development environment is failing to initialize with the following error: ## Error Message > **Error: Failed to install packages in PREVIEW** ## Symptoms * Preview screen displays “Preview Not Supported” or remains blank * Terminal fails to connect with “Failed to connect to terminal” error * Sandbox indefinitely shows “Waiting for sandbox to start…” * Unable to view or test any code changes in the preview ## Project Details * [https://v0.app/chat/fork-of-korean-pc-configurator-DDItxPkr7h1](https://v0.app/chat/fork-of-korean-pc-configurator-DDItxPkr7h1) * Status: Preview completely non-functional This issue is blocking all development work as I cannot preview or test the application. The package installation failure appears to be on the `v0` platform side rather than a code issue. Could you please investigate and resolve this preview environment issue? I need to be able to view and test my application changes. Thank you for your assistance.     Pauline P. Narvas (@pawlean) · 2026-02-24 Thank you for sharing so much detail, @sakarin35! :waving_hand: The v0 team are aware of this issue with preview and are actively working on improving it. In the meantime, you should still be able to see the preview deployment on Vercel. Sakarin35 (@sakarin35) · 2026-02-25 The issue is that I can't see the code or even download it, not just the preview. Any advice on how to check my work? Pauline P. Narvas (@pawlean) · 2026-02-25 Have you tried downloading the zip? Can you talk me through what you've done? Sakarin35 (@sakarin35) · 2026-02-25 At first, the preview worked fine. It only stopped working after I started adding packages or APIs, but since I could still see the code, it wasn't a big issue. However, ever since the code view changed to the VS Code style, I haven't been able to check the code at all lately. Because of this, I've been downloading the entire project as a zip file as a workaround, but now that isn't working either. As you can see in the image, the download button is disabled. When I hover over it, it says 'waiting for sandbox to start.' Is there any other way to check or access my code in this state?"