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The solution is simple enough: first, close the app, or if it won't close, force-close it.
Then, re-launch the SmartStart app, after a brief pause of at least 5 seconds.
Supposedly this error is owing to the login session having expired. (You may have to log in again.) That matches up well enough with your observation that it worked the first time you used it, but not now - it may perhaps have been awhile, and your previous login expired? Let me know how it comes out. Thanks.