(when adding jar) - Module "android" must not contain source root

Question

I'm trying to add gdx-tools.jar to a libGDX project in IntelliJ. The result:

Module "android" must not contain source root ".../android/src". The root already belongs to module "android".

This is what I've tried:

project structure > libraries > new project library > java > select "gdx-tools.jar" >select module "desktop"

project structure > modules > select "desktop" > new > jars or directories > select "gdx-tools.jar" >

Ideas?

Answer 1

Just by going to the Artifacts Settings, Modules, Sources tab, and you will see 2 folders called "gen" and "gen[generated]", delete "gen" by clicking on the X icon to the right of it.

look:

Answer 2

I had run into a similar issue as well:

Module "(my_project)" must not contain source root "(my project)/src". The root already belongs to module "(my_project)".

As I couldn't do anything on IDEA's configuration UI, I opened up the IDEA project file (my_project.iml) in vi, hoping to find out what's wrong:

<sourceFolder url="file://$MODULE_DIR$/my_project/src" type="java-resource" /> <sourceFolder url="file://$MODULE_DIR$/my_project/src" isTestSource="false" /> <!-- Duplicate entry found in project file --> 

So eventually I solved my case by removing the duplicate entry manually.

As the IDEA project files were generated automatically from Gradle files, I have no idea what caused the duplicate entries to be created, but for those facing similar issues, a quick glance at the .iml file may help.