You ran into a serious Bug, if you have legitly aquired this Block, please report it immidietly/en

You ran into a serious Bug, if you have legitly aquired this Block, please report it immidietly [sic] is a block that exists in versions 2-4. It is the block used to represent a GregTech TileEntity block that has lost the TileEntity data that would otherwise identify it. It is most commonly created after server crashes in which the world does not correctly save, and is used as an emergency fallback to prevent further world corruption.

Other than through a server crash or other "serious Bug", there is no way to "legitly aquire this Block".