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Hi Eric, probably it's missing the output string. Take a look on the instructions that I found on the following tableau help topics:
Tips for creating your credentials file
Tableau Prep uses information from the flow file and from the credentials .json file to run the flow when you have remote connections. For example, the database name for your remote connections and the project name for your output files come from the flow, and the server name and the log in credentials come from the .json file.
To avoid errors when running the flow, make sure your credentials file follows these guidelines:
- No remote output connection? Include this syntax at the bottom of the .json file
"outputConnections":[ ] }
- No port ID for your input connection? Don't include the
"port":xxxx,reference in the .json file, not even
- When referencing the
"serverUrl":don't include a "/" at the end of the address. For example, use this
"serverUrl": "http://server"not this
- If you have multiple input or output connections include the credentials for each one in the file.
You can find the entire information on https://onlinehelp.tableau.com/current/prep/en-us/help.html#prep_save_share.html%3FTocPath%3D_____8
I hope this help you.