c# - Problem with error messages in solution -

i have solution around 10 projects, have not written of myself, i'm going take on project here. project main project based on wpf. when try run project, following compiler error:

the tag 'routingmanagerview' not exist in xml namespace 'clr-namespace:routingmanager.views;assembly=routingmanager'. line 29 position 14. c:\source\wsa\wsaclient\views\mainview.xaml 29 14 wsaclient

then, if double click error message, xaml opened, , designer loaded, designer not load, , 3 more error messages:

unable load metadata assembly 'wsaclient'. assembly may have been downloaded web. see http://go.microsoft.com/fwlink/?linkid=179545. following error encountered during load: not load file or assembly 'wsaclient' or 1 of dependencies. system cannot find file specified. c:\source\wsa\wsaclient\views\mainview.xaml 1 1 wsaclient

unable load metadata assembly 'routingmanager'. assembly may have been downloaded web. see http://go.microsoft.com/fwlink/?linkid=179545. following error encountered during load: not load file or assembly 'routingmanager, version=0.0.0.0, culture=neutral, publickeytoken=null' or 1 of dependencies. system cannot find file specified. c:\steria\forsvaret\p6088\source\wsa\wsaclient\views\mainview.xaml 1 1 wsaclient

the type 'views:routingmanagerview' not found. verify not missing assembly reference , referenced assemblies have been built. c:\source\wsa\wsaclient\views\mainview.xaml 29 14 wsaclient

i googled it, , many have suggested because dll locked since originates internet. in condition, not have dll. it's complaining on 2 projects part of solution, wsamanager , routingmanager. got source code on zip file on usb pen, , have extracted somewhere on c drive, there no remote access of code.

if have had same or similar problem earlier, highly appreciate pointers here on how resolve this.

edit

the last error message given on line in xaml file:

<views:routingmanagerview datacontext="{binding dependency}"/>  

and on top of xaml file, import assembly:

xmlns:views="clr-namespace:routingmanager.views;assembly=routingmanager" 

resolve right clicking on solution , choosing 'rebuild solution'