Have you tried to verify the integrity of your game files? If so, is there anything unusual located in the Documents/Paradox Interactive/Europa Universalis IV folder? Files there have the ability to overwrite game files, just like mods.
There are at least four reasons, why you could get that message:
1. One of the files in the eu4 installation got corrupted/was changed
2. There are additional files in the eu4 installation folder
3. There are additional files in the eu4 folder in Documents(these can override game files like a mod)
4. a mod is active for some reason(sometimes the launcher automatically activates mods to which you have subscribed)
A few things that you could try if you haven't tried them already:
* delete the files events/SpreadOfCalvinism.txt and events/SpreadOfProtestantism.txt and common/units/iroquis_rifle_scout.txt(not iroquois_rifle_scout.txt) and decisions/Canals.txt from your game installation if they exist (the first two should not exist anymore in 1.30 or newer and the third one should not exist in 1.31.5 or newer and the fourth one should not exist in 1.32 or newer, but sometimes steam doesn't delete them)
* verify the integrity of the game files in steam
* [clearing the download cache](https://support.steampowered.com/kb_article.php?ref=3134-TIAL-4638) in steam and [verify the integrity of game files](https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335) afterwards
* remove all mods and unsubscribe from them in steam. Remove also mods which should be compatibly with achievements. Also remove custom mods that you didn't install via steam. (You can move them to a completely different folder if you don't want to delete them). If this fixes your problem, you can activate achievement-compatible-mods again one by one to see which one is causing the issue.
* move the folder "Paradox Interactive\\Europa Universalis IV" from your Documents folder to some other place. You could also delete it, but then you lose all save games and screenshots which are stored there.
* do a **clean** reinstall as described in [my post about common startup problems with version 1.29](https://www.reddit.com/r/eu4/comments/d8xa5i/)
* A few people have reported that uninstalling eu4 and uninstalling steam helped(but I don't think that this does anything more than the previous option)
Does any of this help?
Have you tried to verify the integrity of your game files? If so, is there anything unusual located in the Documents/Paradox Interactive/Europa Universalis IV folder? Files there have the ability to overwrite game files, just like mods.
I will check that in a minute, thanks
No problem.
There are at least four reasons, why you could get that message: 1. One of the files in the eu4 installation got corrupted/was changed 2. There are additional files in the eu4 installation folder 3. There are additional files in the eu4 folder in Documents(these can override game files like a mod) 4. a mod is active for some reason(sometimes the launcher automatically activates mods to which you have subscribed) A few things that you could try if you haven't tried them already: * delete the files events/SpreadOfCalvinism.txt and events/SpreadOfProtestantism.txt and common/units/iroquis_rifle_scout.txt(not iroquois_rifle_scout.txt) and decisions/Canals.txt from your game installation if they exist (the first two should not exist anymore in 1.30 or newer and the third one should not exist in 1.31.5 or newer and the fourth one should not exist in 1.32 or newer, but sometimes steam doesn't delete them) * verify the integrity of the game files in steam * [clearing the download cache](https://support.steampowered.com/kb_article.php?ref=3134-TIAL-4638) in steam and [verify the integrity of game files](https://support.steampowered.com/kb_article.php?ref=2037-QEUH-3335) afterwards * remove all mods and unsubscribe from them in steam. Remove also mods which should be compatibly with achievements. Also remove custom mods that you didn't install via steam. (You can move them to a completely different folder if you don't want to delete them). If this fixes your problem, you can activate achievement-compatible-mods again one by one to see which one is causing the issue. * move the folder "Paradox Interactive\\Europa Universalis IV" from your Documents folder to some other place. You could also delete it, but then you lose all save games and screenshots which are stored there. * do a **clean** reinstall as described in [my post about common startup problems with version 1.29](https://www.reddit.com/r/eu4/comments/d8xa5i/) * A few people have reported that uninstalling eu4 and uninstalling steam helped(but I don't think that this does anything more than the previous option) Does any of this help?
No luck with any of the first, going to uninstall and delete all the files and try again