In this version of Zomboid, some buttons in the inventory interface have been removed due to duplicate names with similar functions (as described by the developers in the code). This causes errors related to attempts to use these non-existent buttons.

To fix this, simply comment out lines 106, 107, and 115 in the file:
"~\workshop\content\108600\3397561666\mods\InventoryTetris\42\media\lua\client\InventoryTetris\Patches\Core\InventoryTetris_InventoryPage.lua"

For those unfamiliar, I'm attaching the corrected file:
https://drive.google.com/file/d/1wDgxSM1AzLy3haha-PwL7zk6a3iT1hSX/view?usp=drive_link