I am getting this error code trying to implement Pointshop 2:

[ERROR] addons/pointshop2/lua/ps2/shared/sh_0_pointshop2.lua:96: attempt to index a string value with bad key ('static' is not part of the string library)
1. error - [C]:-1
2. __index - lua/includes/extensions/string.lua:310
3. LoadPersistentItem - addons/pointshop2/lua/ps2/shared/sh_0_pointshop2.lua:96
4. s - addons/pointshop2/lua/ps2/server/sv_pointshopcontroller.lua:509
5. succ - addons/libk/lua/libk/shared/1_sh_promises.lua:48
6. Done - addons/libk/lua/libk/shared/1_sh_promises.lua:116
7. Then - addons/libk/lua/libk/shared/1_sh_promises.lua:107
8. loadModuleItems - addons/pointshop2/lua/ps2/server/sv_pointshopcontroller.lua:506
9. loadPersistent - addons/pointshop2/lua/ps2/server/sv_pointshopcontroller.lua:519
10. func - addons/pointshop2/lua/ps2/server/sv_pointshopcontroller.lua:531
11. f - addons/libk/lua/libk/shared/1_sh_promises.lua:31
12. Resolve - addons/libk/lua/libk/shared/1_sh_promises.lua:175

I am not sure how to fix this but any help would be greatly appreciated!