title: Unable to cast object of type System.Reflection.CustomAttributeData visual studio 2012 windows phone 8
body: <p>My windows phone 7.5. application works properly but after upgrading it to windows phone 8 o.s. my visual studio can't run my application and showing it error in mainpage.xaml file at 1 line  like
  I have doesn't  implemented any richtext box I have implemented coading4fun toolkit. </p>
  
  <blockquote>
    <p>"Unable to cast object of type 'System.Reflection.CustomAttributeData'
    to type 'System.ComponentModel.TypeConverterAttribute'</p>
  </blockquote>
  
  <p>I have visual studio 2012 express for windows phone 8 with update 4
  how can I solve that. please help me thanks in advance.</p>