Plugin error: Could not load file or assembly 'Box.V2, Version=1.0.0.0

Hi 

Currently, I am working with MS Dynamics CRM integration with box.com. I have added one nugget package Box.V2 and I have used properties of Box.V2 .dll file. I have registered the plugin on create of Account Post Operation. Now when I am creating a record I

"Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]:
Could not load file or assembly 'Box.V2, Version=1.0.0.0, Culture=neutral, PublicKeyToken=ddda8fe64dde1ac3' or one of its dependencies. The system cannot find the file specified.Detail:"

Please find attached error file that we are receiving while creation of account record.

Thanks