Authorization errors after transferring application to another person

[fabiano_develop]

I transferred an application I developed to a client along with the corresponding google sheet. 

They are able to access both application and the sheet separately, but when running it, several errors like this are displayed:

Unable to load App

Unable to fetch app definition.

Error: Data table 'TableABCD' is not accessible due to: (
"error": (
"code": 401,
"message": "Request had invalid authentication credentials. Expected Auth 2 access token, login cookie or other valid authentication credential. See hxxps://developers .google .com/ identity/ sign- in/ web/ devconsole-project . *,
"errors: [
"message": "Invalid Credentials",
'domain": "global",
"reason": "authError",
"location": "Authorization",
"locationType": "header"
],
"status": "UNAUTHENTICATED"

I have transferred an application before to another client and I didn't experience any issues. Could someone help me?

Thanks in advance!

[AleksiAlkio]

#1 - What data source are you using with the app?
#2 - What do you exactly mean by "Running it"? You said "they are able to access the app".
#3 - Are all tables "Shared?"
#4 - Are all tables set as "As app creator"?

[fabiano_develop · Accepted solution]

Hi, Aleksi.

Thanks for your support. The data source settings were the original ones when the application was first created.

The application is working now. After reviewing the error message complaining about an invalid security token format, I asked the client to follow the standard procedure:

1. Sign out of appsheet and google.

2. Clean all cookies in the browser. Attention! This will require that you re-login back to signed in sites, so only do it if you remember all your passwords.

3. Restart the browser.

4. Login back to appsheet and google sheets.

5. Run the application.

And this worked. I will leave this here in case someone experiences the same situation.

Thanks again!