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I think it might be throwing you an error because the table you are attempting to output too already exists.
Make sure to adjust the highlighted piece of your output to not "Create New Table", if your table exists in your database already. You can change it to "Delete and Append" or "Append" depending on how you are attempting to update the table.
"Delete and Append" = Drop all data and put the data you are feeding it to the table, keeping the same table structure
"Append" = Keep all the data, just add the new data to in the table with the rest of the rows.
"Overwrite Table (Drop)" = Drop entire table structure and data from database and re-create from scratch
If you are using the In-DB tools you have the same options as the output tool.
I was getting this error in one of my workflows too and after many hours of scouring forums I discovered that I had left a space before the schema name in the 'Table Name' textbox. When I removed this, the error disappeared.
This may not be the same issue for other users, but I thought I would mention just in case it helps anyone else.