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Given the ambiguity, I'll provide a general overview that might help:

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: If you encounter errors while merging or converting newer games, your keys are likely outdated. You must dump the latest keys from a Switch running the most recent firmware to support newer titles. Helpful Tips for Better Content Management

file or a specific builder (NSCB) is "better" for your workflow, here is a conceptual breakdown of what that article would cover. Why Optimized Keys.txt Files Improve Your NSCB Workflow In the world of Nintendo Switch content management, NSCB (Nintendo Switch Content Builder)

Run: nscb --listkeys You should see all your titlekeys and common keys without red text.

NSC Builder (NSCB)

To use effectively, your keys.txt must match or exceed the firmware version of the games you are processing. If your keys are from an older firmware than the game requires, the tool will fail to decrypt and process the files. Setting Up keys.txt

If you cannot dump your own keys, the next best thing is merging keys from multiple reputable sources. Use a text comparison tool (like WinMerge or VS Code diff) to:

Better approach:

Remove hardcoded paths and use relative paths or environment variables.