optim.pml()

[JacobAFW]

Essentially the job optim.pml() function just continues to run (I have left if for hours) and when I finally give up and stop it it returns the error below. The same piece of code was working perfectly a month ago and would only take a couple of minutes to run.

I'm still relatively new to the world of R, and don't know whats happening under the hood with the function so I am not sure how to interpret the error. I have tried the basics like uninstalling and reinstalling packages, both current and old versions, and done the same with R. I have also tried saving the optim.pml() output as a new object (as was advised by someone else). I am stuck so any help would be appreciated. Thank you.