This bug was originally marked as duplicate of bug 171347, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related.
Build: NetBeans IDE 6.9 (Build 201006101454)
VM: Java HotSpot(TM) 64-Bit Server VM, 17.1-b03-307, Java(TM) SE Runtime Environment, 1.6.0_22-b04-307-10M3261
OS: Mac OS X
GUEST: Going to checkout a project from a subversion repository.
GUEST: No idea
GUEST: Opening the software.
GUEST: Trying to checkout new project - select tools, subversion - client hangs
GUEST: abrindo o netbeans (analisando projetos)
GUEST: Checking out SVN Repository
GUEST: going thru process to check out.
GUEST: This error happened when I started netbeans.
GUEST: NB was opened when there was no exicting project sources. Then i was trying to use Team>Subversion>Checkout but url field was inactive.
alexismp: Just brought up the check out from SVN window. The repository field is greyed out.
GUEST: Try to checkout a project from SVN displays a form that asks for the SVN URL, however, nothing can be entered there
Created attachment 102916 [details]
fix: #570b696ce11c - http://hg.netbeans.org/core-main/rev/570b696ce11c
Integrated into 'main-golden', will be available in build *201012010001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
User: Ondrej Vrabec <email@example.com>
Log: Issue #191862 - NullPointerException at org.netbeans.modules.subversion.ui.wizards.checkoutstep.CheckoutStep.setup