Actually I found this annoying too. I thought I fixed it. Not sure it is a bug in new version of B4A or I misconfigure something.
Edit: When you get the error:
1. Delete the folder mipmap-anydpi-v26
2. Copy the folders Objects/res/drawable and Objects/res/mipmap (contains some PNG files) from the zip file again into the project.
3. Compile in Debug first to make sure no errors.
4. Compile in Release.
* The PNG files were deleted when compiling or Clean project first time running the project.