Photon plugin has problem with Unity 5

I have installed Unity 5 and add PUN+ plugin to it!
It work normal with Android and the standalone!

But when I switch to Windows phone 8, i have some issues:
- First of All : I built it as normal and i got this error:
Plugin 'Photon3Unity3D.dll' is used from several locations:
Assets/Plugins/Photon3Unity3D.dll would be copied to <PluginPath>/Photon3Unity3D.dll
Assets/Plugins/WP8/Photon3Unity3D.dll would be copied to <PluginPath>/Photon3Unity3D.dll
Please fix plugin settings and try...

Photon plugin has problem with Unity 5