When you try to get the item command, for example, /give @p 1, writes an error that the object with id not found. After all id 1 is a block of stone, which is present initially in Minecraft.
Sorry for my English. The problem occurs with version snapshots 14w03b and above.
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Duplicate of MC-45037 – If you have not, please use the search function in the future, to see if your bug has already been submitted.
It happens so because Minecraft moved on to use the items name instead of a number. (for example, stone would be minecraft:stone) You can see the item's name in two ways: first is in the creative tab, where it shows the items id/name at the bottom of the selected item. Second, if you write "/give <playername> minecraft:" and then press TAB, then it will show all the possible names. By typing "/give <playername> minecraft:<some letter(s)>", you can select only the items which begin with the letters you wrote after "minecraft:". Hope I could help!