Ugh, A .zip archive.
It's execing, so it is in a .zip.
Loading Add-On: Weapon_Scepter
Executing Add-Ons/Weapon_Scepter/server.cs.
Add-Ons/Weapon_Scepter/server.cs (0): preload failed for scepterItem: ShapeBaseData: Couldn't load shape "Add-Ons/Weapon_Scepter/shapes/scepter.dts".
Add-Ons/Weapon_Scepter/server.cs (0): preload failed for scepterImage: Unable to load shape: Add-Ons/Weapon_Scepter/shapes/scepter.dts.
6 datablocks added.
Notice where it says Weapon_Scepter/shapes/scepter.dts?
Notice how you don't have a shapes folder in your .zip?
Two ways to fix this.
Either place the two folders inside a folder called shapes in the .zip.
Or, you can change the shapefile = " whatever you put in here";
to
shapefile = "./scepter.dts";
in both the item and the image.