c# - The tag 'ViewModelLocator' does not exist in XML namespace clr-namespace:XXX -

i have tried numerous other solutions without success. have class called viewmodellocator located in portable class library. has property in called viewmodels, of type dictionay<k, v>

then have windows phone 8 project references portable class library. added following wp8 app.xaml:

<application     x:class="kaizen.wp8.test.app"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:phone="clr-namespace:microsoft.phone.controls;assembly=microsoft.phone"     xmlns:shell="clr-namespace:microsoft.phone.shell;assembly=microsoft.phone"     xmlns:test="clr-namespace:foo.core.portable.viewmodel;assembly=foo.core.portable">     <application.resources>          <test:viewmodellocator x:key="viewmodellocator">             <test:viewmodellocator.viewmodels>                 <test:sampleviewmodel x:key="samplevm"/>             </test:viewmodellocator.viewmodels>         </test:viewmodellocator>     </application.resources> </application> 

when press f12 on tags, navigates correct class , or property in pcl. indicates vs knows objects, when try , build, receive following error:

the tag 'viewmodellocator' not exist in xml namespace 'clr-namespace:foo.core.portable.viewmodel;assembly=foo.core.portable'.

the tag 'sampleviewmodel' not exist in xml namespace 'clr-namespace:foo.core.portable.viewmodel;assembly=foo.core.portable'.

could please provide assistance?

[update] reference pcl version of mvvm light in pcl project. how viewmodellocator class looks like:

public class viewmodellocator {     public dynamic this[string viewmodelname]     {                 {             if (this.viewmodels.containskey(viewmodelname))             {                 return this.viewmodels[viewmodelname];             }              else             {                 return null;             }         }     }      public dictionary<string, viewmodelbase> viewmodels { get; set; }      public viewmodellocator()     {         this.viewmodels = new dictionary<string, viewmodelbase>();     } } 

my wp8 project makes use of mvvm light pcl assemblies. noticed that, if make use of viewmodelbase class dictionary value, when errors. it's there's issue using mvvm light pcl between 2 projects?! [update]

many in advance!! kind regards,

i had problem .net 4.5 project. solution me change .net 4.0, ignore warnings, , change .net 4.5. problem gone.

don't know if feasible way others, worked me.

best regards.