Vuforia 5.5.9 and Unity 64bit problem

Hello,

I have installed Vuforia 5.5.9 on Unity 5.3.4 64bit and trying to execute an example I have this error:

Failed to load 'Assets/Plugins/x86/VuforiaWrapper.dll', expected 64 bit architecture (IMAGE_FILE_MACHINE_AMD64), but was IMAGE_FILE_MACHINE_I386. You must recompile your plugin for 64 bit architecture.
Vuforia.WebCamAbstractBehaviour:IsWebCamUsed()
Vuforia.WebCamAbstractBehaviour:IsWebCamUsed()
Vuforia.VuforiaRuntimeUtilities:IsVuforiaEnabled()...

Vuforia 5.5.9 and Unity 64bit problem