@nuLL55, I'm also getting this same problem. Well, when I had my old computer, running Windows last year, I got the problem twice. It seems to be something has gone wrong with Teams, and if you get this message, I'm sure you cannot access to the profile picture. Well, I fixed this problem with just three simple ways:
1) Save any unsaved work on your computer, close all the applications, and restart your computer. It might solve the problem, for you, as it is quite of a good thing to restart, as Teams may be lacking with something, so if you restart, it will be good as new.
2) If that didn't work, unninstall Teams from your computer. In order to do this, go to the Start Menu and navigate to the Microsoft Teams app's shortcut. Righ click on the shortcut, and click unninstall. It will open control panel (if you're in Windows 10, 8, 8.1, or 7), where you need to navigate again to the Microsoft Teams title, and double click on it, to unninstall. Then download Teams from the website, and install again.
3) You can use the web version, of Teams. Even though with a not a lot features, the web version can do the most things, the desktop version can, so since this problem, I've been using the web version of Teams, and I've done a lot. 
To access the web version, simply go onto, the Teams website, and access the web version, and sign in, which is simple! 
(teams.microsoft.com)
(I REALLY RECCOMEND YOU TO DO THIS. THIS WILL FIX THE PROBLEM WITH NO RISKS. 
)
please use the above method, to do it in simple ways... I reccomend all the options. ☝☝☝PLEASE DON'T TRY TO FORMAT YOUR COMPUTER, AS IT MAY CAUSE DAMAGE TO YOUR SYSTEM.
I hope this help you.
