ERROR: Running multiple emulators with the same AVD is an experimental feature for ubuntu in android Studio?

Question

I'm working on Android Studio version 3.5.1. I have created multiple emulators as per my requirements.
Some emulators are working fine, but while running some another emulator, facing above raised issue as:

ERROR: Running multiple emulators with the same AVD is an experimental feature.
Emulator: Process finished with exit code 1

Answer 1

Solution:

In Ubuntu OS,
1. Go to Home --> press ctrl+h to visible hidden files

2. Open .android folder --> .avd folder --> Open your Device API specific folder
       For ex. for my device it was "Nexus_6P_API_22.avd" folder.

3. Delete below mentioned files: 
       a. multiinstance.lock
       b. hardware-qemu.ini.lock
       c. cache.img

Answer 2

in addition, to Sanakhatun Shaikh answer delete

d. cache.img.qcow2