Light projector artifact? [Solved]

I tried to make a neon light effect with a projector, but I get this strange artifact:

I have tried to tweak far clip and near clip, but with no luck…

Just found the solution here: [Unity3D 3.5.6f4] Get rid of shadow projector artefact - Questions & Answers - Unity Discussions

just choose “advanced” texture typ in import settings and uncheck “generate mipmaps”.