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Error Handling
FlowAPI will pass information back to your application in a number of ways.
Under normal operation information is passed back as either function results, or changes to variable parameters.
Under error conditions Flow will raise an Exception. You need to be sure that you are wrapping calls to FlowAPI within "try/except" / "try/catch" blocks so that you are respond to the exceptions raised within the FlowAPI.
Event Viewer
Flow will also log messages with the system Event Viewer. This is helpful for diagnosing problems such as failure to Login.