Almost every time I open the emulator, I always get this kind of error after waiting patiently for a long loading process.
I have tried fixing it by reinstalling the SDK, but it still doesn't work.
Note: I must say that I was a newbie android developer at that time.
Some say this is because the Emulator is trying to use the internal sdcard, but doesn't have access. Maybe there is a way to trick the phone into thinking it's internal.
Their opinions led me to the following solution:
Wiping data in Android Virtual Device Manager helped me solve this problem. Follow these steps.
Tools -> Android -> AVD Manager -> Actions (triangle down) -> Wipe Data.
There are also Advanced settings, in the virtual device's configuration (click the pencil), where there will be SD card and internal storage configuration.