This usually happens when you copy the wrong dll - there are some dlls with the SDK that are built with Visual Studio, if you have the old SDK the correct path from where to copy the dlls is something like: C:\Qt\2010.05\qt\bin the ones from: C:\Qt\2010.05\bin wont work. And for the new SDK the path is something like: C:\QtSDK\Desktop\Qt\4.7.3\mingw\bin
//this depends on the path you installed the SDK
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