Unable to set my wallpaper which is from my own picture folder.

[賴家亨]

user@user-PC:~$ switchboard
[_LOG_LEVEL_INFO 15:41:50.821031] Application.vala:155: system setting value version: 2.0
[_LOG_LEVEL_INFO 15:41:50.821069] Application.vala:157: Kernel version: 3.19.0-42-generic
[_LOG_LEVEL_INFO 15:41:50.834458] Tweaks.vala:307: Activating Tweak plug
[_LOG_LEVEL_WARN 15:41:50.840664] GtkSettings.vala:48: Error loading GTK+ Keyfile settings.ini: 沒有此一檔案或目錄
[_LOG_LEVEL_WARN 15:41:50.840698] GtkSettings.vala:69: Error getting GTK+ int setting: 設定鍵檔案沒有群組‘Settings’
[_LOG_LEVEL_WARN 15:41:50.876329] PlankSettings.vala:204: 設定鍵檔案包含的群組「PlankDockPreferences」中設定鍵「Monitor」數值無法解譯。
[_LOG_LEVEL_FATAL 15:42:02.240801] gee_abstract_map_clear: assertion 'self != NULL' failed
[_LOG_LEVEL_FATAL 15:42:02.240885] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323190] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323218] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323257] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323276] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323309] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323325] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323375] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323388] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323457] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323485] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323536] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323564] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323616] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323643] system setting value will not function properly.
[_LOG_LEVEL_FATAL 15:42:02.323685] [GLib] g_variant_get_int32: assertion 'g_variant_is_of_type (value, G_VARIANT_TYPE_INT32)' failed
[_LOG_LEVEL_FATAL 15:42:02.323705] system setting value will not function properly.

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[_LOG_LEVEL_WARN 15:42:12.304383] Wallpaper.vala:477: open file「/home/user/.local/share/backgrounds/f6a33898ed5a40449fba2265ca5c55bb.jpg」error happens：no such file or directory
[_LOG_LEVEL_WARN 15:42:29.670191] Wallpaper.vala:477: open file「/home/user/.local/share/backgrounds/wallpaper-2519910.jpg」error happens：no such file or directory
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I have tried my best to translate the messages, it still happens after I create the backgrounds folder in "/home/user/.local/share/"

[wolf (w+lf)]

Looks related to the general custom wallpaper bug: https://bugs.launchpad.net/elementaryos/+bug/1528737