Seemingly Random Build Errors

[Nomron]

Hi! I've really been enjoying this, but randomly it has seemed to stop working. I keep getting these 2 errors upon building:

Shader error in 'Hidden/Blend Image Effect': variable 'o' used without having been completely initialized at line 62 (on d3d9)

Compiling Vertex program
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

Shader error in 'prime[31]/Sprite Light Kit/Shadowed': variable 'OUT' used without having been completely initialized at line 91 (on d3d9)

Compiling Vertex program with DUMMY
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

I have not added anything to either script or done anything to the kit at all. I tried putting in a fresh kit, restarting my computer, and removing the things that were added before it stopped working, but I always get these errors. Does anybody know how to fix them?

I am in version 5.6.5f and have had no previous errors with it.