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Hi there. I'm a one-year LDcad user and now a newbie with LUA and animation. I use LDcad v1.5 on Ubuntu 16.4 LTS. I have reproduced the example in the Roland Merkel Youtube, simplified it and, after some time to struggle, I have an error "Active refline link needed" in the line reading ax1:setOri(ori). I consulted the Message error script console ldcad1.5 topic in the LDraw forum, but this is not the case, and there is no information about LUA in the Internet. I send the animation2.mpd and the .lua files for examination. All seems to be in order, but nothing happens. Any suggestion? Thanks in advance for your help. =========== animation2.mpd =========================== 0 FILE main.ldr 0 Author: Conrad G.-Anleo 0 !LDCAD SCRIPT [source=animation2.lua] 1 16 0 0 0 1 0 0 0 1 0 0 0 1 axel1.ldr 0 FILE axel1.ldr 0 Author: Conrad G.-Anleo 1 7 0 0 0 0 1 0 0 0 -1 -1 0 0 32073.dat 1 14 0 0 0 1 0 0 0 1 0 0 0 1 32072.dat ========== animation2.lua ================= --[[ animation2.lua (c) Conrad G.-Anleo ]] function register() local ani=ldc.animation('demo') ani:setLength(20) ani:setEvent('frame', 'onFrame') end function onFrame() local ani=ldc.animation('demo') local mainSf=ldc.subfile() local ori=ldc.matrix() local angle=-4*360*ani:getFrameTime()/ani:getLength() local ax1=mainSf:getRef('axle1') ori:setRotate(angle, 1, 0, 0) ax1:setOri(ori) end register() ============= END ==============================