What It Means & How to Fix It in UE5

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🧠 Why You’re Seeing This Error

This is a generic error that shows up when the Blueprint compiler encounters a symbol (function, variable, node, or macro) that is missing, invalid, or corrupted.

In UE5, this usually happens when:

• A function, variable, or event was deleted or renamed, but it’s still being referenced
• A node is referencing an outdated or broken symbol
• The Blueprint was created in an older version of UE or migrated from another project
• You’re referencing a class that has changed in C++, and the Blueprint is out of sync

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💥 Example Error Message

Error during compilation symbol 'SomeFunction'

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🛠️ Common Blueprint Scenario

[Event BeginPlay] → [Call Function: SomeFunction] → ❌ Function no longer exists

This node still tries to call SomeFunction, but that function has been removed or renamed — and the compiler doesn’t know how to resolve it.

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✅ How to Fix It in UE5 – Step-by-Step

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✔️ 1. Open the Compiler Results and Look for the Broken Symbol

- Open the Blueprint
- Click Compile
- Scroll through the Compiler Results panel
- Look for specific mentions of missing symbols or nodes

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✔️ 2. Find and Replace or Delete the Broken Node

Look for nodes with:

- Red outlines
- Missing function names
- No connected pins

Delete and replace them with updated logic.

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✔️ 3. Recreate the Function or Variable If It Was Removed Accidentally

If it was something you removed yourself:

- Recreate the variable, macro, or function with the same name
- Reconnect it to restore functionality

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✔️ 4. If Migrated from Another Project, Repoint Any Class References

- Open Class Settings
- Check parent class
- Make sure all references are valid in the current project

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✅ Summary: How to Fix “Error During Compilation Symbol” in UE5

Cause	Fix
Missing or deleted function	Recreate or replace the function node
Renamed or moved variable	Update the reference or remove it
Broken node after migration	Reconnect nodes and verify class references
C++ class changes	Recompile project and refresh Blueprint