Find the solution in this article for - A circular reference was detected while serializing an object of type System.RuntimeType
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Solution to exception when trying to save an object/class to a ASP.Net Session
Solution for Exclusive access could not be obtained because the database is in use
In this post you will find the solution for the Error - MSDTC on server servername is unavailable.
Solution - When trying to use the DoDirectPayment example - This transaction cannot be processed due to an invalid merchant configuration.