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pip check found a missing required package

pyramid 1.5.2 requires WebOb, which is not installed.

pip check found that an installed package depends on another package that is missing from the environment.

requires <package>, which is not installedpackage managers

Observed message

pyramid 1.5.2 requires WebOb, which is not installed.

Why it happens

  • A dependency was removed manually or by another installer.
  • The environment became inconsistent after partial upgrades or failed installs.
  • A package was installed without all of its runtime dependencies being present.

How to fix it

  1. Install the missing dependency or reinstall the package that requires it.
  2. Run pip check after package changes to confirm the environment is consistent again.
  3. If multiple dependencies are broken, rebuild the virtual environment from a clean requirements or lock file.

Official reference

pip documentation: pip check

Related errors

No matching distribution foundpip cannot find a compatible package versionResolutionImpossiblepip cannot resolve conflicting dependency requirementsrequires WebOb, which is not installedpip check found a required package that is not installedhas 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