Failed to load shaders.

[06:13:27] [Client thread/WARN]: Failed to load shader: minecraft:shaders/post/entity_outline.json
ow: Invalid shaders/program/sobel.vsh: Couldn't compile vertex program: ERROR: 0:1: '' : Version number not supported by GL2
ERROR: 1 compilation errors. No code generated.
at cti.a(SourceFile:67) ~[1.8.jar:?]