Error: System.TypeInitializationException: The type initializer for 'Oracle.DataAccess.Client.OracleConnection' threw an exception. Oracle.DataAccess.Client.OracleException: The provider is not compatible with the version of Oracle client

Please be sure you have installed the correct Oracle client as described in this article.

Note that a 64 bit version of Sync & Save requires a 64 bit version of the Oracle client.