My save was corrupted when I tried to change my inventory to clay bricks and other things like glass and bedrock.
got the error "Non-negative number required. i think it F m8. do u have dupe items in the game? or did any1 of yr mates did the dupe glitch on it?
there are dupe items, but howd u get that error msg? When I try to play it, it doesnt load. When I put it in 360revolution, Minecraft.exe stops working.
i downloaded your save and tried to add it into the mod tool without success, my minecraft.exe crashed.. if this happens the save is.. well.. dead for a better word. theres not much else you can do except try and force the game to save onto the HDD if you can get it to load up, which i doubt it will.
I was able to use 360 rev on the save. My guess is that by putting clay, glass panes or bedrock in it messed it up.
I thought Glass panels are not in the game as of yet (unless they added it in an update) but bedrock -- even though its in the editor -- is not recommended for use and should be used at your own discretion, as it does work but unbreakable if made a mistake and can cause corruption eventually.
you can add mob spawners in the game, i have done myself, but they can cause crashes. if you have sorted your problem i will lock the topic.