Hi, I just made a tutorial video how to fix the error.
1. Go to \content\content0\scripts\game\behavior_tree\tasks
2. Delete (Not rename) Hacks folder
3. If you still get errors make sure your mods are compatible with 1.10 patch
Guys, please, stop giving advices about deleting something from the game! You're creating potential problems for gamers and for modders.
If you've updated your game properly and using 1.10 compatible mods, everything should work without a need to delete/move/install anything!
I an going to copy-paste this text here after all, because I have mod users, reading this thread, following all the "delete-it" and "create modBaseScripts" advices and then having problems with the game/mod.
How to update your modded game to patch 1.10 properly (use this method if you have problems with game/mods after patch 1.10)
Note: read to the end before starting making any changes!
1. Backup your <Path To The Witcher 3>\Mods and <Path To My Documents>\The Witcher 3 folders to some place safe.
2. Delete <Path To The Witcher 3>\Mods folder to make sure you have no leftover 1.08 mods and merges.
3. Delete <Path To My Documents>\The Witcher 3\input.settings, <Path To My Documents>\The Witcher 3\input.settings.bak, <Path To My Documents>\The Witcher 3\user.settings and <Path To My Documents>\The Witcher 3\user.settings.bak to both make sure all changes from patch 1.10 are applied properly and that you don't have leftover changes from 1.08 mods.
4. Delete <Path To The Witcher 3>\content\content0\scripts folder and <Path To The Witcher 3>\content\content0\x64.final.redscripts file.
5. Delete <Path To The Witcher 3>\bin\config\r4game\user_config_matrix\pc\input.xml file.
6. If you have ever edited ini files in <Path To The Witcher 3>\bin\config folder delete the whole <Path To The Witcher 3>\bin\config folder to make sure you graphics and keybindings settings are vanilla.
7. If you ever had reshade or console enabler, remove them from the game folder. If unsure what to remove, delete the whole <Path To The Witcher 3>\bin folder.
8. Verify the game using Steam/GOG game files verification option.
9. Run the game once to let it create default settings files.
10. Install mods one by one, make sure that mods you're installing were updated to work with patch 1.10.
And another piece of advice:
If you're constantly having problems with modifying game files, move your Steam/GOG library or just The Witcher 3 install folder out of the Program Files folder tree.