... what does it mean? Is the problem wellknown? In earlier versions, I did'nt have this problem, but don't know, if the critical change is in b4r or arduino ide. The Error: "\Adafruit_ADS1015.cpp:21:30: fatal error: Adafruit_ADS1015.h: No such file or directory" is probably shown in b4r, but imported from IDE?
1. You have posted this thread in B4R Libraries forum. Only actual libraries should be posted there.
2. Never add files to the internal libraries folder unless the instructions specifically say so.
3. The internal libraries folder is not searched for anything during compilation.
You can install the library with Arduino IDE and change the include command to use <Adafruit_ADS1015.h> instead of "Adafruit_ADS1015.h" or include the files inside the folder of one of the already referenced libraries. This way it will be copied to the project folder during compilation.