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If you review your error log what does it state? It might be good to clear it (Tools > Clear Error Log), reproduce the issue, and then review the error log (Tools > View Error Log).
The root cause of the issue will be just before the "Automation Error" notification as FDM write issues in order from the top down.
Is this a x64 server? Specified Cast is invalid indicates that the adpater was not registered properly. If it is a x64 server the adapter needs to be registered manually.
Follow document 1073992.1 to resolve the issue.
Try going into the mapping section and browsing for target value. 9 times out of 10 an automation error seems to be related to an inability to connect to the target system. The most common cause in my experience relates to entereing a Domain on the login page when one isn't required, but there are other causes as well.