Error while registering plugin

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Plug-in assembly does not contain the required types or assembly content cannot be updated.
Detail: <OrganizationServiceFault xmlns="schemas.microsoft.com/.../Contracts" xmlns:i="www.w3.org/.../XMLSchema-instance">
  <ErrorCode>-2147204725</ErrorCode>
  <ErrorDetails xmlns:a="schemas.datacontract.org/.../System.Collections.Generic" />
  <Message>Plug-in assembly does not contain the required types or assembly content cannot be updated.</Message>
  <Timestamp>2016-09-08T05:58:09.4544764Z</Timestamp>
  <InnerFault>
    <ErrorCode>-2147204725</ErrorCode>
    <ErrorDetails xmlns:a="schemas.datacontract.org/.../System.Collections.Generic" />
    <Message>Plug-in assembly does not contain the required types or assembly content cannot be updated.</Message>
    <Timestamp>2016-09-08T05:58:09.4544764Z</Timestamp>
    <InnerFault i:nil="true" />
    <TraceText i:nil="true" />
  </InnerFault>
  <TraceText i:nil="true" />
</OrganizationServiceFault>

Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
   at Microsoft.Crm.Tools.Libraries.RegistrationHelper.UpdateAssembly(CrmOrganization org, String pathToAssembly, CrmPluginAssembly assembly, PluginType[] type)
   at Microsoft.Crm.Tools.AssemblyRegistration.PluginRegistrationViewModel.btnregisterClick()