Ionic 4 running on android device error

So I’m trying to run ionic 4 on my device. Followed eveything in the installation guide in the website and going through the running on android tab. This is what I get.

But i already installed android studio. Here is my installed sdk. Im trying to run it on an android 9 device.

And here is my /etc/environment:

Am I missing something?

Found the solution to my question

IDK if some of you people have the same problem, but it’s because of the Gradle. I installed it the way the website said, tried both automatically with SDKmanager and also the manual downloads. Still didnt worked for me. So I installed it using:

sudo add-apt-repository ppa:cwchien/gradle

sudo apt-get update

sudo apt-get install gradle

Then find location where it was installed via ‘whereis gradle’ then add to path. Now I can install the app on my device