A browser could not be downloaded during the install
A mevcore app hosting error at the “install and build” stage.
What it means
Puppeteer, Playwright or Cypress downloads a browser while installing.
The error happened while installing dependencies or building the project. The new version was not started, the current one keeps running.
Typical causes
- The install or build command exited with an error
- Out of memory or disk space
- The language or package manager version is not the one the project expects
How to fix it on mevcore
If the application does not need it on the server, skip the download: on the «Environment» tab set PUPPETEER_SKIP_DOWNLOAD=true, PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1 or CYPRESS_INSTALL_BINARY=0. Keep test tools in devDependencies.
- 1 Open the app in the mevcore panel: the Problems card on the overview shows this error and the log line it was found in.
- It is fixed on the “Environment” tab of the app.
- 2 After the fix, deploy again. If it fails again, the log ends with [mevcore] lines naming the new error code.
- 3 The "Ask AI" button next to the error prepares a request for ChatGPT or Claude: the error code, the end of the log without secrets and the app settings.
For an AI assistant
The same in English: paste it together with the log into the AI chat.
mevcore error code: install.browser_download phase: install and build diagnosis: A browser could not be downloaded during the install platform hint: Puppeteer, Playwright or Cypress downloads a browser while installing. If the application does not need it on the server, skip the download: on the «Environment» tab set PUPPETEER_SKIP_DOWNLOAD=true, PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1 or CYPRESS_INSTALL_BINARY=0. Keep test tools in devDependencies. platform docs: https://mevcore.com/llms-full.txt
All error codes · How to prepare your project for mevcore · llms-full.txt
Can't fix it?
Message support with the error code: we will tell you what to change in the project or settings.