Your sync failed with the following details: "Failed: no more information"

Problem/Issue:

When you view a lead’s activity history, you noticed a failed sync activity type with the following example:

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Reason/Cause:
This message is very general and can be caused by a number of sync related errors. In order to get more information, you will need to double-click the error message and a separate pop-up window will appear. Search for the section labeled: “SFDC Error:” like the following example:

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Fix/Solution:
Depending what the error message is, Salesforce provides a website that lists all Core Data Types used in API calls.   You can access it by clicking here.