libgdx : The Gradle build demon : error and what does it do?

So i had some problems trying to get my project to be packed to a APK and a JAR.
(i created a post about it earlier, but figured since i specifically want to solve the build daemon problem here I’d start a new post)

I decided to download the latest libgdx nightly build, create a test project and see if i could pack the “empty” project.
But within the libGDX project setup I already encountered a problem:
-Build failed with an exception
-A problem occured starting proces ‘Gradle build daemon’

And trying to package my projects on the commandline with:

gradlew android:assembleRelease

Gave me the same error (see image)

I’m not sure how to fix this.
Do i need to install this daemon & how do i do that? Or should I change some settings somewhere?