I had the same problem.
My mistake was that I defined the email settings in .env file, and i forgot to import that settings to my app file.
And I still got that error, until I declared my :
mail = Mail(app)
after all that imported settings.
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I had the same problem.
My mistake was that I defined the email settings in .env file, and i forgot to import that settings to my app file.
And I still got that error, until I declared my :
mail = Mail(app)
after all that imported settings.