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"Unable to start sync: null" Error when performing Product Catalog clean up

Problem: Customer was performing the Product Catalog clean up in their Sandbox and was receiving the error "Unable to start sync: null" as shown below:

Screen Shot 2019-11-15 at 10.49.52 AM.png


Solution: In this specific scenario, when we checked our internal logs we found the below error:

```PrintFullErrorFromSFDC: com.zuora.sync.sfdc.exception.SfdcSyncException: 
Invalid login, password or token; or user locked out.```

And on updating the Salesforce credentials being used to sync the data from Zuora --> Salesforce, this issue was resolved.  

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