do you get this error message when launching the Qlikivew app or when you try to open a QVW?
if you getting the error when trying to open a QVW, try opening the QVW without data
http://oneqlikatatime.blogspot.sg/2012/06/back-door-access-to-your-qlikview.html
if it is during launching the app backup the license and Control key information and try uninstalling and re-installing the application
Vineeth Pujari
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