ty for your answer
Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Operation is not valid due to the current state of the object.Detail:
<OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts">
<ActivityId>97940a65-c2d1-4850-9cfb-decdd5b18a6f</ActivityId>
<ErrorCode>-2147220891</ErrorCode>
<ErrorDetails xmlns:d2p1="schemas.datacontract.org/.../System.Collections.Generic">
<KeyValuePairOfstringanyType>
<d2p1:key>OperationStatus</d2p1:key>
<d2p1:value xmlns:d4p1="www.w3.org/.../XMLSchema" i:type="d4p1:string">0</d2p1:value>
</KeyValuePairOfstringanyType>
<KeyValuePairOfstringanyType>
<d2p1:key>SubErrorCode</d2p1:key>
<d2p1:value xmlns:d4p1="www.w3.org/.../XMLSchema" i:type="d4p1:string">-2146233088</d2p1:value>
</KeyValuePairOfstringanyType>
</ErrorDetails>
<Message>Operation is not valid due to the current state of the object.</Message>
<Timestamp>2019-12-31T06:33:05.8299282Z</Timestamp>
<ExceptionSource i:nil="true" />
<InnerFault i:nil="true" />
<OriginalException 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]
Starting sync workflow 'SLA MobinTech', Id: eea2467d-bdcb-e911-80f2-005056bd1d96
Sync workflow 'SLA MobinTech' terminated with error 'Operation is not valid due to the current state of the object.'
</TraceText>
</OrganizationServiceFault>