Description: Fix spelling error
Author: Mateusz Łukasik <mati75@linuxmint.pl>

--- a/src/tree.c
+++ b/src/tree.c
@@ -102,7 +102,7 @@ void tree_apply()
 
     if (!obt_xml_save_file(parse_i, p, TRUE)) {
         gchar *s;
-        s = g_strdup_printf("An error occured while saving the "
+        s = g_strdup_printf("An error occurred while saving the "
                             "config file '%s'", p);
         obconf_error(s, FALSE);
         g_free(s);