Hi, sorry if this is in the wrong place, this is my first post.
So I was playing a Technic modpack (Super Modded Survival) about 2 or 3 days ago. I went into NEI to look for an item ID. I got the ID for the Mysterium Portal, and when I used the /give command, my game crashed. I can still get into the modpack, but that specific world crashes on startup. After research, I can assume that for whatever reason, that specific item shouldn't be spawned in through command or something. The only solution I could think of was deleting my player.dat to reset my inventory. BUT, whenever I do so, it just re-creates itself with all previous items. If anybody has a possible solution it would be VERY much appreciated.