KhaineGB love your work, but you need to fix the ModInfo.xml within "Lockable Inventory Slots" you forgot one key thing <ModInfo> </ModInfo> so you can't install with Vortex otherwise. I added it on my end, but for anyone else that needs this for installing within your mod manager. Just make sure that your ModInfo.xml file should read like this and you should be fine:
<?xml version="1.0" encoding="UTF-8" ?>
<xml>
<ModInfo>
<Name value="LockableSlots" />
<DisplayName value="Khaine's Lockable Slots" />
<Description value="Adds a box to the backpack and vehicle to allow users to lock slots so they cant be moved." />
<Author value="KhaineGB" />
<Version value="1.0.0.1" />
<Website value="https://7daystodiemods.com/lockable-inventory-slots/" />
</ModInfo>
</xml>
(Edit) - Got this error even after I changed the ModInfo.xml: