PPv2 error : "Fog.hlsl" missing

I’ve had a few problems with collab (flashnews) and it keeps restoring an old folder of PPv2 in the project, which I keep deleting because I use package and here is the latest in unity technology of keeping you amused:

Shader error in 'Hidden/PostProcessing/MultiScaleVO': failed to open source file: '../StdLib.hlsl' at line 9 (on d3d11)

Compiling Vertex program with FOG_LINEAR APPLY_FORWARD_FOG
Platform defines: UNITY_ENABLE_REFLECTION_BUFFERS UNITY_USE_DITHER_MASK_FOR_ALPHABLENDED_SHADOWS UNITY_PBS_USE_BRDF1 UNITY_SPECCUBE_BOX_PROJECTION UNITY_SPECCUBE_BLENDING UNITY_ENABLE_DETAIL_NORMALMAP SHADER_API_DESKTOP UNITY_COLORSPACE_GAMMA UNITY_LIGHT_PROBE_PROXY_VOLUME UNITY_LIGHTMAP_RGBM_ENCODING

oh boy, everything blew up