Error with an interface patch

Hello, it turns out that I have been playing with a graphical menu patch, called Glue Patch by s0h2x, a user who creates patches and addon backports for WoW 3.3.5, and I was very happy with the patch until today when I made it. a death knight.

Because when you start the game with the patch installed and a death knight created, an error appears, which I will attach in an image next to the patch link in case you decide to install it and try it, to see if you know the problem.

In any case that I cannot solve it and I must wait for the author to decide to create an update, which I sincerely believe he will not do, do you know of any alternative similar to this? Because I like the aesthetics of the patch enough to simply lose it.

The error https://imgur.com/a/yLaQlmX

The link of patch https://github.com/s0h2x/wow_patch-glue

Thanks and greetings in advance.

I would assume from the error text that the patch does not support the Spanish client.

I tried in eng and appears like spanish.