During loading and uloading this happens

[15:38:44] [Client thread/ERROR]: @ Post render
[15:38:44] [Client thread/ERROR]: 1286: Invalid framebuffer operation

(no errors during actual gameplay)

[16:52:11] [Client thread/ERROR]: ########## GL ERROR ##########
r operation
[16:52:15] [Client thread/ERROR]: ########## GL ERROR ##########
[16:52:15] [Client thread/ERROR]: @ Post render
[16:52:15] [Client thread/ERROR]: 1286: Invalid framebuffer operation
[16:52:16] [Client thread/INFO]: Reloading ResourceManager: Default
[16:52:17] [Client thread/INFO]: SoundSystem shutting down...
[16:52:17] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com
[16:52:17] [Sound Library Loader/INFO]: Starting up SoundSystem...
[16:52:17] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[16:52:17] [Thread-13/INFO]: Initializing LWJGL OpenAL
[16:52:17] [Thread-13/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[16:52:17] [Thread-13/INFO]: OpenAL initialized.
[16:52:17] [Sound Library Loader/INFO]: Sound engine started
[16:52:18] [Client thread/INFO]: Created: 512x512 textures-atlas
[16:52:22] [Client thread/INFO]: Stopping!
[16:52:22] [Client thread/INFO]: SoundSystem shutting down...
[16:52:23] [Client thread/WARN]: Author: Paul Lamb, www.paulscode.com