The only thing you're doing wrong is using loop-text instead of loop-value, loop-text would only work with text literals.

 

Thank you for the quick reply. Well I have no errors now, it just writes "item is worth <none> Gold".

Replaced loop-text with loop-value.

 

Could you show me how the lore of the item looks like? Also, what does {_price::1} outputs?

 

Ok so I had to restart my server for it to read lore properly, might be a citizens bug? {_price::*} and {_price::1} now outputs the correct amount.

You saved my day @Snow-Pyon, thank you so much <3

--- Double Post Merged, Aug 20, 2017, Original Post Date: Aug 20, 2017 ---

Sorry to disturb you again @Snow-Pyon, but I have a similar error now, trying to sell all items containing the right lore. I get the item data error again.
Can you spot why? Oh and btw, It removes 1 of each of the looped items, but what if you have a stack of 2? I've tried messing around with it, but the money dont add up, it just removes more items.

Code:

Code (Skript):

1. command /sellall:
2.     trigger:
3.         loop all items in player's inventory:
4.             set {_lore::*} to lore of loop-item split by "||"
5.             loop {_lore::*}:
6.                 set {_test::*} to uncolored loop-value parsed as "Sell Price: %number% %text%"
7.                 play "BLOCK_NOTE_XYLOPHONE" to player at volume 1
8.                 remove 1 of loop-item from player's inventory
9.                 add {_test::1} to player's balance
10.                 send "&6You sold your item for: &e%{_test::1}% Gold" to player
11.                 send "&6You now have: &e%player's balance% Gold" to player
12.                 exit loop
13.                 stop

Thank you very much.

--- Double Post Merged, Aug 21, 2017 ---

bump. Anyone got an idea how to do this?