Deadly Landar

Everytime I add skin weight to a mesh to Rig it and upload it, it crashes leaving an error message. Its only when I select the skin weight box everytime without fail. Heres the message that shows: Error/newview/llappviewer.cpp(1772) : LLappviewer::mainloop : Bad memory allocation in LLappviewer::mainloop()! Please help :/ i tried changing the mesh I even took down the quality to make it appear all blocky but it still gives me the same error message. Ive even tried using more then one viewer.