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Hi san_gr and welcome to the forums! I could open your VI just fine in LabVIEW 2009. The code contains a mathscript node that was empty so I removed it and saved for previous version from LabVIEW2009 to LabVIEW8.2 as you have not stated what version of LabVIEW you where using. Are you able to open the attached? If so it may isolate the issue somewhat. elevator6.vi [LabVIEW8.2] <edit> Under your aviator I see LabVIEW8.6, so I guess this answers one of my questions </edit>