This is a Java preferences error due to Windows having a corrupted registry.  It's not a MASON thing -- try googling for "java.util.prefs.WindowsPreferences" and "Could not open/create prefs root node" for some more information.

Sean

On Mar 25, 2016, at 4:39 PM, Brant Horio <[log in to unmask]> wrote:

> Hi all, I'm still new to MASON and while I was recently able to run the models with no problem, a new error has started appearing in the console. I haven't installed any new Java updates so it's curious to me why this is coming up.
> 
> The error is the following:
> Mar 25, 2016 4:25:41 PM java.util.prefs.WindowsPreferences <init>
> WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
> 
> I am using MASON v19, and running the code through Eclipse, Version: Mars.1 Release (4.5.1).
> 
> Again, even though this pops up, the models seem to run fine with no problem. Any one with some idea of how to resolve this (or if it even needs resolving?)
> 
> Thanks!
> Brant