The dialog box says:
Location information has been specified incorrectly.
svn: E210004: Number is larger than maximum
Keep location anyway?
This just started to occur. I updated the SVN server to 1.8. It was working fine with 1.7.9. I'm using svn+ssh. I have the latest updates (todate) of SVN Subversive and connector SVNKit 1.7.9.
BTW, this still works from the command line just fine.
I encountered the same bug under Eclipse with Subclipse 1.8.22 after upgrading my Subversion server from 1.6.12 to 1.8.3.
I solved my problem by upgrading my client to Subclipse 1.10.2 (SVNKit 1.8).
For Netbeans, as SVNKit 1.8 has not been integrated yet (but hope it will be soon), you can specify a commandline client (menu Tools/Options/Misc/versioning/Subversion/Preferred client). This should work with any svn client version from 1.6 to 1.8 (and maybe older).
Check Netbeans FAQ about this incompatibility and workaround: http://wiki.netbeans.org/FaqSubversion1_8