Darkprince97

I forgot. Make the canInteractWith() method in your container aleays return true.

public boolean onBlockActivated(World par1World, int par2, int par3, int par4, EntityPlayer par5EntityPlayer, int par6, float par7, float par8, float par9) { TileEntityMerchantBlock merchantBlock = (TileEntityMerchantBlock)par1World.getBlockTileEntity(par2, par3, par4); par5EntityPlayer.openGui(TheAlphaElement.instance, 0, par1World, par2, par3, par4); return true; } Here is your problem.Just change it to: public boolean onBlockActivated(World par1World, int par2, int par3, int par4, EntityPlayer par5EntityPlayer, int par6, float par7, float par8, float par9) { if(!par1World.isRemote){ TileEntityMerchantBlock merchantBlock = (TileEntityMerchantBlock)par1World.getBlockTileEntity(par2, par3, par4); par5EntityPlayer.openGui(TheAlphaElement.instance, 0, par1World, par2, par3, par4); } return true; }