When notes is launched, the following errors are appeared:

/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:112: Unable to locate image file in pixmap_path: "tabs/tab-right-active.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:116: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:120: Unable to locate image file in pixmap_path: "tabs/notebook.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:123: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:126: Unable to locate image file in pixmap_path: "tabs/notebook.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:129: Background image options specified without filename

/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:55: Unable to locate image file in pixmap_path: "tabs/tab-bottom.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:59: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:63: Unable to locate image file in pixmap_path: "tabs/tab-top.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:67: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:71: Unable to locate image file in pixmap_path: "tabs/tab-left.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:75: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:79: Unable to locate image file in pixmap_path: "tabs/tab-right.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:83: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:88: Unable to locate image file in pixmap_path: "tabs/tab-bottom-active.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:92: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:96: Unable to locate image file in pixmap_path: "tabs/tab-top-active.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:100: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:104: Unable to locate image file in pixmap_path: "tabs/tab-left-active.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:108: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:112: Unable to locate image file in pixmap_path: "tabs/tab-right-active.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:116: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:120: Unable to locate image file in pixmap_path: "tabs/notebook.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:123: Background image options specified without filename
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:126: Unable to locate image file in pixmap_path: "tabs/notebook.png"
/usr/share/xfce4-notes-plugin/gtk-2.0/notes.gtkrc:129: Background image options specified without filename

Version:
notes git-master
xfce4-vala git-master
vala 0.16

Build & Platform:
Build 2015-04-21 on ArchLinux