install.gem_not_found

Gem <gem> not found

A mevcore app hosting error at the “install and build” stage.

What it means

Bundler found no gem <gem> in the version the Gemfile asks for: a typo, a version that does not exist, or a gem from a private source.

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

Check the line in the Gemfile; a private source needs its credentials in a BUNDLE_<HOST> variable on the Environment tab.

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 “Settings” 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.gem_not_found
phase: install and build
diagnosis: Gem <gem> not found
platform hint: Bundler found no gem <gem> in the version the Gemfile asks for: a typo, a version that does not exist, or a gem from a private source. Check the line in the Gemfile; a private source needs its credentials in a BUNDLE_<HOST> variable on the Environment tab.
platform docs: https://mevcore.com/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.

App hosting