# MICROFRONTENDS_MISSING_FALLBACK_ERROR

The `MICROFRONTENDS_MISSING_FALLBACK_ERROR` error occurs when a microfrontends request did not match any other deployments in the same environment, and no deployment could be found for the specified fallback.

## Troubleshoot

To troubleshoot this error, follow these steps:

In the [Production](/docs/deployments/environments#production-environment) environment, this error should not occur since every request is routed to the Production environment of mcirofrontends projects. Make sure that every project in the microfrontends group has a production deployment.

In non-Production environments, the fallback is configured in the [Fallback Environment](/docs/microfrontends/managing-microfrontends#fallback-environment) setting. Based on the configured option, check that every project has a deployment for that environment.

If the issue persists after checking that every project has a deployment in the configured Fallback Environment setting, please contact Vercel support to reach out to the team.


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title: "MIDDLEWARE_INVOCATION_FAILED"
description: "The request for an Routing Middleware was not completed successfully. This is an application error."
last_updated: "2026-02-03T02:58:42.065Z"
source: "https://vercel.com/docs/errors/MIDDLEWARE_INVOCATION_FAILED"
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