Data Gateway Error: The parameter is incorrect.

After uninstalling the gateway software from the C:\ drive on a server and reinstalling (using the migrate option) to the D:\ drive, I'm getting the following error message when I try to create a new data source: Unable to create a data source. There was an error in the data gateway. [Gateway Cluster Name]: The parameter is incorrect.

I tried it with both a SQL Server and Oracle source and got the same message. I also tried restarting the gateway. The only thing I did differently on the reinstall/migration besides the drive it's on was used a service account name for the email address, rather than my personal email address. The data sources that existed before the reinstall/migration seem to still be working, as their status says "Online." 

Any insight into what could be causing this error?

Thanks.