I want to unregistered (delete) plugin with plugin registration tool but error below don't permit
Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Action failed for assembly 'CloudafzarSMSCRM, Version=1.0.0.0, Culture=neutral, PublicKeyToken=e6d6c51e2896736e': Assembly must be registered in isolation.
Detail: <OrganizationServiceFault xmlns="schemas.microsoft.com/.../Contracts" xmlns:i="www.w3.org/.../XMLSchema-instance">
<ActivityId>00000000-0000-0000-0000-000000000000</ActivityId>
<ErrorCode>-2147220906</ErrorCode>
<ErrorDetails xmlns:a="schemas.datacontract.org/.../System.Collections.Generic" />
<Message>Action failed for assembly 'CloudafzarSMSCRM, Version=1.0.0.0, Culture=neutral, PublicKeyToken=e6d6c51e2896736e': Assembly must be registered in isolation.</Message>
<Timestamp>2017-05-13T10:47:26.7312919Z</Timestamp>
<ExceptionSource i:nil="true" />
<InnerFault>
<ActivityId>00000000-0000-0000-0000-000000000000</ActivityId>
<ErrorCode>-2147220906</ErrorCode>
<ErrorDetails xmlns:a="schemas.datacontract.org/.../System.Collections.Generic" />
<Message>Action failed for assembly 'CloudafzarSMSCRM, Version=1.0.0.0, Culture=neutral, PublicKeyToken=e6d6c51e2896736e': Assembly must be registered in isolation.</Message>
<Timestamp>2017-05-13T10:47:26.7312919Z</Timestamp>
<ExceptionSource i:nil="true" />
<InnerFault i:nil="true" />
<OriginalException i:nil="true" />
<TraceText i:nil="true" />
</InnerFault>
<OriginalException i:nil="true" />
<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.Unregister(CrmOrganization org, ProgressIndicator prog, ICrmEntity[] crmEntity)
at Microsoft.Crm.Tools.PluginRegistration.OrganizationControlViewModel.<>c__DisplayClass16.<Unregister_Clicked>b__10(Object o, DoWorkEventArgs e)
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