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pip check found a required package that is not installed

PACKAGE requires DEPENDENCY, which is not installed.

pip check found an installed package with a declared dependency that is missing from the current environment.

requires WebOb, which is not installedpackage managers

Observed message

PACKAGE requires DEPENDENCY, which is not installed.

Why it happens

  • A required dependency was removed from the environment.
  • A partial installation or manual package change left the environment inconsistent.
  • The environment contains packages installed by different tools that are no longer aligned.

How to fix it

  1. Install the missing dependency into the same environment.
  2. Reinstall the affected top-level package if the dependency graph is damaged.
  3. Use isolated virtual environments to avoid cross-tool environment drift.

Official reference

pip documentation: pip check

Related errors

No matching distribution foundpip cannot find a compatible package versionResolutionImpossiblepip cannot resolve conflicting dependency requirementsrequires <package>, which is not installedpip check found a missing required packagehas requirement X, but you have Ypip check found an installed dependency with the wrong version

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pip requires package which is not installed: causes and fixes | Error Atlas