Start Building

Unreal Engine 5.5 Packaging Fails with Plugin Not Found - Module Fix

Packaging in Unreal Engine 5.5 can fail even when the editor opens and gameplay runs. A common blocker is an error like Plugin Not Found, Could not find plugin, or a follow-up module load/build failure during BuildCookRun. This usually means project metadata references a plugin or module configuration that no longer matches what is on disk.

This guide gives you a fast, safe workflow to fix the issue and verify packaging works again.

The Problem

You start packaging and receive one or more of these messages:

  • Plugin 'X' failed to load because module 'Y' could not be found
  • Unable to find plugin 'X'
  • Missing precompiled manifest for 'Y'
  • Expecting to find a type to be declared in a module rules named ...

The editor might still launch, but cook/package fails.

Why this happens

Most cases come from one of these root causes:

  1. Stale plugin reference in .uproject after a plugin rename/removal
  2. Wrong module name in .uplugin or *.Build.cs compared to folder/source names
  3. Plugin enabled for unsupported target (for example, editor-only plugin in shipping build)
  4. Leftover binaries/intermediate files from old engine/plugin versions
  5. Engine version mismatch between plugin binaries and current UE 5.5 install

Fix 1 - Verify plugin references in .uproject

  1. Open your project .uproject in a text editor.
  2. Find the Plugins array.
  3. Confirm every enabled plugin actually exists either:
    • under your project Plugins/ folder, or
    • in the engine's plugin directory for your UE 5.5 install.
  4. Remove or disable broken entries you no longer use.

Example check:

  • Entry says "Name": "MyGameplayPlugin"
  • You must have Plugins/MyGameplayPlugin/MyGameplayPlugin.uplugin present (or engine equivalent).

Verification: Re-open project and ensure no startup plugin warnings appear before re-packaging.

Fix 2 - Check .uplugin module names and types

Open the failing plugin's .uplugin and inspect Modules.

Confirm:

  • Module Name matches actual source folder under Source/
  • Module Type is correct (Runtime, Editor, Developer, etc.)
  • Editor-only modules are not required in shipping runtime path

If you package for game runtime, the runtime module must be available for non-editor targets.

Fix 3 - Validate Build.cs and target rules

In Source/<Module>/<Module>.Build.cs:

  • Ensure class name matches module name exactly
  • Ensure dependencies are valid for your target
  • Remove editor-only dependencies from runtime modules where needed (UnrealEd, editor tool modules, etc.)

In your Target.cs files:

  • Check module list and plugin requirements are consistent with your packaging target
  • Avoid loading editor utility modules in Game/Client shipping targets

Fix 4 - Clean stale build artifacts

After fixing references, clear stale outputs:

  1. Close Unreal Editor.
  2. Delete project folders:
    • Binaries/
    • Intermediate/
    • .vs/ (if present)
    • Saved/ (optional for deep cleanup, keep backups if needed)
  3. Regenerate project files.
  4. Rebuild project and package again.

This removes old metadata that can keep triggering false plugin/module failures.

Fix 5 - Confirm plugin compatibility with UE 5.5

If the plugin is third-party:

  • Check vendor release notes for UE 5.5 support
  • Update to the 5.5-compatible version
  • Rebuild plugin from source if precompiled binaries target a different engine version

If source is unavailable and plugin is not 5.5-ready, disable it for this build or pin to a compatible engine branch until update is available.

Official references:

Quick recovery checklist

Run this in order:

  1. .uproject plugin entries valid
  2. .uplugin module names/types valid
  3. Build.cs class/module naming aligned
  4. Editor-only dependencies removed from runtime path
  5. Clean rebuild from fresh Binaries/Intermediate

If packaging still fails, capture the first error in the output log and solve that one first. Later errors are often cascade noise.

Alternative fixes for edge cases

  • Marketplace plugin copied into project and engine both: keep one source of truth; duplicate locations can cause confusion.
  • CI runner caches old plugin binaries: clear build cache on CI and force clean checkout.
  • Different plugin enablement by config: check DefaultEngine.ini plugin sections if behavior differs between machines.

Prevention tips

  • Treat plugin upgrades as tracked changelist items with rollback notes.
  • Pin plugin versions per engine version in team docs.
  • Run a clean package on CI after plugin changes, not only local editor tests.
  • Keep editor utility modules separate from runtime plugin modules.

Related links

Bookmark this fix for your next release build window. Share it with your team if packaging breaks right before a milestone freeze.