NPCC MOD troubleshooting
What to do if the game is not loading, the savegame is not loading, an error pops up, etc.
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Check the version of the game and the version of the mod. If necessary update the game and the mod to the latest versions.
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Try to delete all other mods from the Mods folder except NPCC. If the problem disappears then it is a mods conflict. You need to find a conflicting (or outdated) mod within your Mods folder and remove it.
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If NPCC Mod alone causes an error, check whether the file lastexception.txt has been generated at your The Sims 4 folder. If yes, post its content or upload it somewhere and post a link.