This error is driving me crazy for the past couple of hours. I'm using Ubuntu 12.04 LTS (clean install). What I did afterwards:
update everything
install JDK (using synaptics)
install netbeans (using synaptics, this is version 7.0.1)
I can start NetBeans just fine but I can't create any project. If I choose "New Project" it keeps saying "Please wait..." under "Categories".
I also tried installing versions of netbeans manually. Starting them as root ... nothing helps! :-(
Had the same problem and came across this answer with nice one line command to fix it:
sudo apt-get install openjdk-6-jre=6b24-1.11.1-4ubuntu2 openjdk-6-jre-headless=6b24-1.11.1-4ubuntu2 icedtea-6-jre-cacao=6b24-1.11.1-4ubuntu2
https://askubuntu.com/questions/326556/i-cant-start-a-new-project-on-netbeans
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