Dark Matter? SCNR problem

[Dignacker]

I keep having a problem with Dark Matter. I add chunks to a map in the SCNR tag under COLLECTION(s) with GlitchyGuardian's Reflexive Chunk Adder. Then I open up the map in Dark Matter. I go to the SCNR tag, and I go under meta editor. Then I go to the item number of the chunk I added. Well, I change the weapon to the one that I want and I change the spawn point. I click save changes and an error message comes up like this:



I've tried many different versions of Dark Matter, but they all give me this error. I can't use any other program, because none of them allow me to change the chunk into a different weapon. I would only be able to add one kind of weapon or vehicle. I've been working on this forever, and I really want to fix it. Anyone know what to do?

Sorry if this has already been asked, but I've searched for the answer and I can't find it.