How do I fix this lua error?

[ERROR] A runtime error has occurred in “gamemodes/darkrp/entities/entities/spawned_shipment/init.lua” on line 45.
The best help I can give you is this:

Some smartass thought they were clever by setting the ‘amount’ of shipment ‘Rope Restraint’ to 0.
What the fuck do you expect the use of an empty shipment to be?

- No hints, sorry.

The responsibility for this error lies with (the authors of) one (or more) of these files:
1. gamemodes/darkrp/entities/entities/spawned_shipment/init.lua on line 45
2. [C] on line -1
3. gamemodes/darkrp/entities/entities/spawned_shipment/commands.lua on line 42
4. gamemodes/darkrp/gamemode/modules/chat/sv_chat.lua on line 17
5. gamemodes/darkrp/gamemode/modules/chat/sv_chat.lua on line 206
6. lua/includes/modules/concommand.lua on line 54
------- End of Simplerr error -------

In the words of the error which you clearly didn’t read:

People like you really need to learn to read the error. It literally tells you what lua file is causing the error and the exact fucking line :v