0.5.0: "F-Spot Encountered a Fatal Error"

[Jeremy Andrews <jeremy kerneltrap org>]

Hello,

I tried upgrading to the recently released F-Spot 0.5.0, and got the
following errors.  When launching F-Spot it pops up an alert dialog
titled "F-Spot Encountered a Fatal Error:  Extension node not found in
path: /FSpot/Sidebar".  When I click the Error Details link, I get the
following information:

        An unhandled exception was thrown: Extension node not found in
        path: /FSpot/Sidebar
        
          at Mono.Addins.ExtensionContext.AddExtensionNodeHandler
        (System.String path, Mono.Addins.ExtensionNodeEventHandler
        handler) [0x00000] 
          at Mono.Addins.AddinManager.AddExtensionNodeHandler
        (System.String path, Mono.Addins.ExtensionNodeEventHandler
        handler) [0x00000] 
          at MainWindow..ctor (.Db db) [0x00000] 
          at FSpot.Core.get_MainWindow () [0x00000] 
          at FSpot.Core.Organize () [0x00000] 
          at FSpot.Driver.Main (System.String[] args) [0x00000] 
        .NET Version: 2.0.50727.42
        
        Assembly Version Information:
        
        pango-sharp (2.12.0.0)
        SemWeb (0.7.1.0)
        glade-sharp (2.12.0.0)
        FSpot.Widgets (0.0.0.0)
        FSpot.JobScheduler (0.0.0.0)
        System.Transactions (2.0.0.0)
        System.Configuration (2.0.0.0)
        System.Xml (2.0.0.0)
        NDesk.DBus.Proxies (0.0.0.0)
        gconf-sharp (2.20.0.0)
        System.Data (2.0.0.0)
        Mono.Data.SqliteClient (2.0.0.0)
        FSpot.Query (0.0.0.0)
        gdk-sharp (2.12.0.0)
        gnome-vfs-sharp (2.20.0.0)
        NDesk.DBus.GLib (1.0.0.0)
        NDesk.DBus (1.0.0.0)
        Mono.Posix (2.0.0.0)
        Cms (0.0.0.0)
        System (2.0.0.0)
        FSpot.Utils (0.0.0.0)
        FSpot.Core (0.0.0.0)
        atk-sharp (2.12.0.0)
        gtk-sharp (2.12.0.0)
        Mono.Addins (0.3.0.0)
        Mono.Addins.Setup (0.3.0.0)
        gnome-sharp (2.20.0.0)
        glib-sharp (2.12.0.0)
        f-spot (0.5.0.0)
        mscorlib (2.0.0.0)
        
        Platform Information: Linux 2.6.24-21-generic x86_64 unknown
        GNU/Linux
        
        Distribution Information:
        
        [/etc/debian_version]
        lenny/sid
        
        [/etc/lsb-release]
        DISTRIB_ID=Ubuntu
        DISTRIB_RELEASE=8.04
        DISTRIB_CODENAME=hardy
        DISTRIB_DESCRIPTION="Ubuntu 8.04.1"
        
If I click OK, the program exits.  If I try again, I get the same exact
error.

As noted in the above output, I compiled F-Spot on Ubuntu 8.04.  In
order to satisfy some dependencies, I upgraded some mono packages from
the following Hard Heron repository:
        https://launchpad.net/~ruben/+archive

Running from the command line, I get the following output:
        $ f-spot
        [Info  10:42:11.387] Initializing DBus
        [Info  10:42:11.514] Initializing Mono.Addins
        [Info  10:42:11.684] Starting new FSpot server
        [Warn  10:42:12.897] Caught an exception - Extension node not
        found in path: /FSpot/Sidebar (in `Mono.Addins')
          at Mono.Addins.ExtensionContext.AddExtensionNodeHandler
        (System.String path, Mono.Addins.ExtensionNodeEventHandler
        handler) [0x00000] 
          at Mono.Addins.AddinManager.AddExtensionNodeHandler
        (System.String path, Mono.Addins.ExtensionNodeEventHandler
        handler) [0x00000] 
          at MainWindow..ctor (.Db db) [0x00000] 
          at FSpot.Core.get_MainWindow () [0x00000] 
          at FSpot.Core.Organize () [0x00000] 
          at FSpot.Driver.Main (System.String[] args) [0x00000] 

Searching Google for this error, I only found a google cache of a
pastebin entry where someone else had posted this same error:
http://74.125.45.104/search?q=cache:cGBakjxkIRgJ:pastebin.ca/raw/1089598
+An+unhandled+exception+was+thrown:+Extension+node+not+found+in+path:
+/FSpot/Sidebar&hl=en&ct=clnk&cd=1&gl=us

The only abnormality I noticed during compilation was the following:
        ./configure: line 21293: GNOME_COMPILE_WARNINGS: command not
        found

Any tips on how I can fix this?

Thanks,
 -Jeremy