Your additional libraries folder is also incorrect. Don't put it in Program Files which is a protected folder. Better to put it in your Documents folder.
Where did you get the android-31 platform from? That is not correct. The SDK download from the B4A product page has android-30. Install a new SDK, follow the instructions exactly and don't run SDK Manager.
B4A includes all the features needed to quickly develop any type of Android app. B4A is used by tens of thousands of developers from all over the world, including companies such as NASA, HP, IBM and others.
How is your Bibliothèques Extra folder defined and what do have in it ?
The AdditionalLibraries (Bibliothèques Extra) folder should have the structure below:
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