https://imgur.com/SRFwXko

A more detailed title would have been nice, but: I also hit it, and I'm pretty sure everyone will. Error text is:

Error while loading entity prototype "picker-pipe-marker-beam" (beam): Beam animation frame count mismatch. light_animations.start(16) must have the same number of frames as tail (1).

It looks like the beam gained a new light_animations field in the latest release. Setting it to nil removes the new features it brings to lasers, and gets the mod working again.

Reference: https://github.com/wube/factorio-data/blob/da3b817dbbef7dc630d18123b357a5180b7cf8dc/base/prototypes/entity/beams.lua#L143

my image says it all tho

dude, your image link, and the title of your post, both say "uh, sumfink." that is not useful information. the image has the content, hidden a ways from anywhere people are gonna see it. if you want to be lazy, go for it, just don't pretend it isn't being lazy.

Well the general populace arent no coding experts, so where exactly are we talking about putting that line of code?

In the pipe-highlight.lua file inside the mod zip file has a sequence of lines like this

    end
    underground_marker_beams[#underground_marker_beams + 1] = marker_beams
end

It should read like this instead:

    end
    marker_beams.light_animations = nil
    underground_marker_beams[#underground_marker_beams + 1] = marker_beams
end

No it has not.

That seems to have fixed it, thanks Omni!

This has been fixed in the latest version.

heh. I just showed up to check my notifications, and is redundant. @JohnnyBandit, I'm wasn't trying to advise anyone who doesn't already know how to write the relevant code on fixing this. I'll make sure I'm clearer about that.

I figure if I'm not willing to support people through trouble making that change, I shouldn't give them the half way version, and I'm not willing to do that support at this time.

@slippycheese - I figure that anybody who knows that a mod file is a zip and knows how to hunt through a lua file within that zip to change a few lines knows that they're doing so at their own risk. :-)