Error in MVC when create controller - Code First

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C#

MVC

Hello
I Have Probelm When Create MVC APP code First

i create models and Context And Initializer, and Set Webconfig File

But When Create Controller i find this message

"""
Error
There was an error running the selected code generator :
'unable to retrieve metadata for 'nameofApp.model.class'.
sections must only appear once per config file. see the help topic<location> for Exception.
(c:\users\nameofdevice\AppData\local\temp-mpCD0C.tmp line 20 )
"""