Texture Offset Error

[Diablobo]

Every time I try to manually type in the texture and then hit "Apply" I get this error.

invalid command name "update_texture_offset"
invalid command name "update_texture_offset"
while executing
"update_texture_offset $texture_offset_x $texture_offset_y 0"
invoked from within
".t.apply invoke"
("uplevel" body line 1)
invoked from within
"uplevel #0[list $w invoke]"
(procedure "tk::ButtonUp" line 24)
invoked from within
"tk::ButtonUp .t.apply"
(command bound to event)

So right now the only way I can change the texture is to use the slider, which isn't as precise as I would like it to be.