diff -Nur soundconverter-2.0.4-orig/soundconverter/gstreamer.py soundconverter-2.0.4/soundconverter/gstreamer.py
--- soundconverter-2.0.4-orig/soundconverter/gstreamer.py	2012-10-04 13:56:26.000000000 +0200
+++ soundconverter-2.0.4/soundconverter/gstreamer.py	2013-02-10 14:57:32.940211007 +0100
@@ -187,7 +187,7 @@
             return
         self.done()
         if result == gst.pbutils.INSTALL_PLUGINS_USER_ABORT:
-            show_error(_('Plugin installation aborted.'))
+            show_error('Error',_('Plugin installation aborted.'))
             return
 
         show_error('Error', 'failed to install plugins: %s' % gobject.markup_escape_text(str(result)))
@@ -518,7 +518,7 @@
         if not encoder:
             # TODO: is this used ?
             # TODO: add proper error management when an encoder cannot be created
-            show_error(_("Cannot create a decoder for \'%s\' format.") % 
+            show_error('Error',_("Cannot create a decoder for \'%s\' format.") % 
                         self.output_type)
             return
 
@@ -529,7 +529,7 @@
         if dirname and not gnomevfs.exists(dirname):
             log('Creating folder: \'%s\'' % dirname)
             if not vfs_makedirs(str(dirname)):
-                show_error(_("Cannot create \'%s\' folder.") % dirname)
+                show_error('Error',_("Cannot create \'%s\' folder.") % dirname)
                 return
 
         self.add_command('%s location="%s"' % (