CRM Business Process Error : When creating an account->Changing customer type from Prospect to Indirect->At Submit stage BPE pops in(Attached the log file).Please help with your suggestion to find out the cause of error !!

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Principal user (Id=44a44078-0ca4-e711-80de-0050568c5360, type=8) is missing prvAppendToEquipment privilege (Id=dea50329-23c7-43d5-a6d0-4b66fe48fced)Detail:
<OrganizationServiceFault xmlns:i="www.w3.org/.../XMLSchema-instance" xmlns="schemas.microsoft.com/.../Contracts">
  <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>Principal user (Id=44a44078-0ca4-e711-80de-0050568c5360, type=8) is missing prvAppendToEquipment privilege (Id=dea50329-23c7-43d5-a6d0-4b66fe48fced)</Message>
  <Timestamp>2018-08-07T06:42:38.9552529Z</Timestamp>
  <InnerFault i:nil="true" />
  <TraceText>

[Microsoft.Crm.ObjectModel: Microsoft.Crm.ObjectModel.SyncWorkflowExecutionPlugin]
[7662683d-4699-e811-80e0-0050568c5e14: ]
Starting sync workflow 'Prospective Customer - Send Emails based on Status', Id: 6d62683d-4699-e811-80e0-0050568c5e14
Entering ConditionStep1_step: If Prospect to Indirect and Submitted, then send an email to Master Data
Entering SendEmailStep8_step:
Sync workflow 'Prospective Customer - Send Emails based on Status' terminated with error 'Principal user (Id=44a44078-0ca4-e711-80de-0050568c5360, type=8) is missing prvAppendToEquipment privilege (Id=dea50329-23c7-43d5-a6d0-4b66fe48fced)'

</TraceText>
</OrganizationServiceFault>