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There appears to be a problem with one of the XML files that is storing your Alias for SQL Server. The file is in C:\ProgramData\Alteryx\Engine\System.xml or C:\ProgramData\Alteryx\Engine\User.xml depending on whether or not your alias is a User or System type connection. If you have a non Admin install the same files exist under C:\Users\<your name here>\AppData\Roaming\Alteryx\Engine
If you rename these files you will no longer crash, but you won't have your Aliases any longer. If you want to send me your XML file I can see what is wrong and we can try to fix it.