c# - the name "photoveiwmodel" does not exist -

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i using this example , opened error 

error   1   name "photosviewmodel" not exist in namespace "clr-namespace:photohubsample.viewmodels".   c:\users\mike\desktop\photohub - windows phone 8 xaml longlistselector grid layout sample\c#\photohubsample\mainpage.xaml   73  12  photohubsample

as being example didn't expect errors when loading. still new making apps on windows phone, have no idea how fix this..


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