Error While creating case when mapping entitlement

Hi All,

I have created one Enhanced SLA for Account entity.

Then i have created one Account, later i created one Entitlement for that account and i mapped the SLA which i created in the entitlement.

But when i create case for that account i get error.

1. SLA screen :

2. Entitlement Screen :

3. Case creation in account entity error screen :

Error details in log file as follows :

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: account With Id = ee518188-0f70-e611-8124-c4346bddc181 Does Not ExistDetail:
<OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts">
<ErrorCode>-2147220969</ErrorCode>
<ErrorDetails xmlns:d2p1="schemas.datacontract.org/.../System.Collections.Generic" />
<Message>account With Id = ee518188-0f70-e611-8124-c4346bddc181 Does Not Exist</Message>
<Timestamp>2016-09-01T06:44:31.1031929Z</Timestamp>
<InnerFault i:nil="true" />
<TraceText>
[Microsoft.Crm.Service.ObjectModel: Microsoft.Crm.Service.ObjectModel.CasePostCreatePlugin]
[ffde44b1-a685-4948-85b8-e4091bc2a98b: CasePostCreatePlugin]

[Microsoft.Crm.ObjectModel: Microsoft.Crm.Extensibility.InternalOperationPlugin]
[46f6cf4c-14ae-4f1e-98a1-eae99a37e95c: ExecuteWorkflowWithInputArguments]


</TraceText>
</OrganizationServiceFault>

I have doing the same as mentioned in this link : http://www.powerobjects.com/2014/07/14/spring-wave-14-update-working-entitlements-microsoft-dynamics-crm/

But i get the above mentioned error can anyone help me out in this.

Thanks in advance....