Hello! I am following your tutorial on the 1-bit fulladder. I have gone through the asimut, genpat, scmap and scr already. However, when I tried to execute graal, it said: Error: Can't open display : :0. What is the possible problem that caused that? What should I do? Hoping for your immediate response. Thank you! *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~* MARLA A. CUYUGAN Science Research Specialist II Advanced Science and Technology Institute