I rolled back to a previous save and tried to update again. I got the same error. Then I exported the previous save and opened it in the desktop version of themler. I updated it there successfully and then exported out the updated fixed file. I imported that into my site and was able to open it in themler with the newly updated version.
Still not sure what was causing the error, but hopefully if someone else faces a similar error it will be a help to them.
I rolled back to a previous save and tried to update again. I got the same error. Then I exported the previous save and opened it in the desktop version of themler. I updated it there successfully and then exported out the updated fixed file. I imported that into my site and was able to open it in themler with the newly updated version.
Still not sure what was causing the error, but hopefully if someone else faces a similar error it will be a help to them.