We have noticed some users whom are using the Google Chrome web browser will sometime encounter an error saying: 

"App login has expired. Please go to the Apps page in your Shopify admin to reload the app"

This appears to have been caused by an update to the teelaunch app. Our developers are aware of this error and are actively working to resolve it. 

In the meanwhile, we recommend users try other browsers if they are encountering this error. 

We have seen the most success in users using the updated version of Firefox web browser.