Cyberpunk 2077: Fix “Script Compilation Failed” Errors

When Cyberpunk 2077 throws “script compilation failed” on startup, it means redscript couldn’t compile one or more .reds files from r6scripts. The fix almost always starts with reading the actual error, not guessing. Open r6logsredscript_rCURRENT.log in your game folder and look at the bottom of the file for the real problem, which usually points to a specific mod file, a duplicate, or something missing.

Most of these errors come down to a handful of causes: duplicate mod files, a broken cache, an outdated core framework after a game patch, or a mod conflict. Work through them in order instead of jumping straight to reinstalling everything.

Read the redscript log first

The log at r6logsredscript_rCURRENT.log is your starting point every time. It tells you which file failed and often why. Two common messages and what they mean:

• “field with this name is already defined” usually means the same redscript mod got loaded twice. Something is duplicated somewhere in your r6 folder, often a leftover copy from a manual install plus a mod manager install, or two versions of the same mod sitting in different subfolders.
• References to a missing script file mean a mod depends on another file that isn’t there, either because it was deleted, moved, or never installed in the first place.

Go through your r6scripts folder and any subfolders and look for files with the same name, or the same mod folder appearing twice under different names. Delete the duplicate, not both copies.

Clear the cache and verify your files

If the log doesn’t point to an obvious duplicate, or deleting the duplicate doesn’t fix it, the next step is a clean reset of the compiled script cache:

1. Close the game completely.
2. Go to the r6 folder in your game directory and delete the whole cache folder inside it. Don’t just delete one file, delete the folder so it rebuilds from scratch.
3. Verify your game files through your launcher (Steam, GOG Galaxy, or Epic Games Launcher, depending on where you bought the game).
4. Reinstall redscript itself, since a corrupted or outdated redscript install can cause compilation to fail even when your mods are fine.

Launch the game again after this. A lot of “script compilation failed” errors clear up right here, especially ones caused by a half-updated cache after installing or removing mods.

Bisect your mods if the error won’t go away

If you’ve cleared the cache, verified files, reinstalled redscript, and you’re still getting the error, it’s time to isolate which mod is actually responsible.

1. Disable every mod except your core mods (the frameworks other mods depend on, like RED4ext and redscript itself).
2. Launch the game. If it loads clean, the problem is in one of your other mods.
3. Re-enable half of your remaining mods and launch again.
4. If the error comes back, the problem is in that half. If it doesn’t, the problem is in the half you left disabled.
5. Keep splitting the problem half in two and testing until only one mod is left. That’s your culprit.

This takes longer than it sounds like it should, but it’s far more reliable than disabling mods one at a time by guesswork, especially if you have dozens installed.

Virtual Atelier and cybercmd conflicts

If every mod flagged in your error log is a Virtual Atelier store, don’t treat them as separate problems. Reinstall Virtual Atelier itself along with its required dependencies. A broken or outdated core Atelier install will throw errors across every store built on top of it, which makes it look like dozens of mods are broken when really it’s one shared base.

While you’re in there, check if you have cybercmd installed. If you do, uninstall it. RED4ext now includes cybercmd’s functionality built in, so having both installed at once can cause conflicts that show up as script compilation errors.

Scanning logs quickly with FindAllErrors.bat

Reading logs by hand across multiple mods gets tedious fast. DocPresto’s FindAllErrors.bat tool handles this for you. Drop it in your main game folder and run it. It clears out your old logs first, then scans the fresh ones generated by your next launch and compiles everything into one readable text file.

If you’re reading logs manually instead, keep two things in mind:

• Ignore any log file with a timestamp older than your most recent launch. Old logs from previous sessions will clutter your search and point you at problems you may have already fixed.
• Ignore files with a size of 0. An empty log means nothing was written to it that session, it’s not a sign of a silent error.

After a game update, check your frameworks first

Core mods like RED4ext and redscript are the first things to break when the game patches, simply because they have to be updated to match the new game version. If your script errors started right after an update, don’t assume your mod list did anything wrong. Check your frameworks before you start disabling individual mods.

RED4ext keeps its own log in red4extlogs, and that log tells you exactly which game patch version it expects. Compare that to your actual game version. If RED4ext is built for an older patch than the one you’re running, that mismatch alone can cause scripts to fail compiling, even if every individual mod is otherwise fine. Update RED4ext and redscript to versions that match your current game patch before you troubleshoot anything else.

Questions people ask

Where exactly is the redscript log file?

It’s at r6logsredscript_rCURRENT.log inside your Cyberpunk 2077 game folder. Open it with any text editor and check the bottom for the most recent error.

What does “field with this name is already defined” actually mean?

It almost always means the same redscript mod is loaded from two places at once. Check your r6 folder and subfolders for duplicate copies of the same mod and delete the extra one.

Should I delete my whole r6 folder to fix this?

No, only delete the cache folder inside r6, not the whole thing. Deleting everything in r6 will remove your installed mods along with the cache.

Why did my mods suddenly break after a game update?

Usually because RED4ext or redscript haven’t been updated to match the new game patch yet. Check red4extlogs to see which patch version RED4ext expects and update your frameworks before touching individual mods.

Browse all Cyberpunk 2077 mods on CrashMods