The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))

Question

I am using Word COM Interop to create a Word document in WCF Service which is hosted in IIS. Here is the code that we are using

GeneratedDocument = WordApplication.Documents.Add(

ref docTemplatePath, ref missing, ref missing, ref missing);

ContentControls controls = GeneratedDocument.ContentControls;

DataSet resultSets = this.executeStoredProcedure();

After several debugging in various environments (like local, testing) we have made the below changes and made this service working.

1. In DCom Config, for properties of {000209FF-0000-0000-C000-000000000046} key updated the Identity to This User and gave administrator privileges.
2. Application Pool Identity in IIS is modified to the same Identity of above which is administrator.
3. In Services.msc updated the IIS Admin Service to interact with local desktop.

However when we deploy in the Staging environment we are getting "The message filter indicated that the application is busy. (Exception from HRESULT: 0x8001010A (RPC_E_SERVERCALL_RETRYLATER))" at "GenerateDocument.ContentControls" step.

Can somebody help me in resolving this error?