See: https://cs.chromium.org/chromium/src/chrome/browser/resources/settings/printing_page/cups_printers.js?type=cs&q=addPrinterErrorMessage&sq=package:chromium&g=0&l=178

I think it's caused by this CL https://chromium-review.googlesource.com/c/chromium/src/+/1060341.

Looks like that CL would have caused it- I'll take a look

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1789600ee46dd47e09fa43867cd2af19dfb97a09

commit 1789600ee46dd47e09fa43867cd2af19dfb97a09
Author: Bailey Berro <baileyberro@chromium.org>
Date: Wed Jun 13 00:14:07 2018

Remove reference to non-existant div in Printers settings

This change removes the reference in onAddPrinterTap_ to
addPrinterErrorMessage which was removed in https://crrev.com/c/1060341.

Bug:  chromium:848055 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I5084eac9896331c71c58a9cac2851d1ce14f56ec
Reviewed-on: https://chromium-review.googlesource.com/1089207
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566639}
[modify] https://crrev.com/1789600ee46dd47e09fa43867cd2af19dfb97a09/chrome/browser/resources/settings/printing_page/cups_printers.html
[modify] https://crrev.com/1789600ee46dd47e09fa43867cd2af19dfb97a09/chrome/browser/resources/settings/printing_page/cups_printers.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1789600ee46dd47e09fa43867cd2af19dfb97a09

commit 1789600ee46dd47e09fa43867cd2af19dfb97a09
Author: Bailey Berro <baileyberro@chromium.org>
Date: Wed Jun 13 00:14:07 2018

Remove reference to non-existant div in Printers settings

This change removes the reference in onAddPrinterTap_ to
addPrinterErrorMessage which was removed in https://crrev.com/c/1060341.

Bug:  chromium:848055 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I5084eac9896331c71c58a9cac2851d1ce14f56ec
Reviewed-on: https://chromium-review.googlesource.com/1089207
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566639}
[modify] https://crrev.com/1789600ee46dd47e09fa43867cd2af19dfb97a09/chrome/browser/resources/settings/printing_page/cups_printers.html
[modify] https://crrev.com/1789600ee46dd47e09fa43867cd2af19dfb97a09/chrome/browser/resources/settings/printing_page/cups_printers.js

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1789600ee46dd47e09fa43867cd2af19dfb97a09

commit 1789600ee46dd47e09fa43867cd2af19dfb97a09
Author: Bailey Berro <baileyberro@chromium.org>
Date: Wed Jun 13 00:14:07 2018

Remove reference to non-existant div in Printers settings

This change removes the reference in onAddPrinterTap_ to
addPrinterErrorMessage which was removed in https://crrev.com/c/1060341.

Bug:  chromium:848055 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I5084eac9896331c71c58a9cac2851d1ce14f56ec
Reviewed-on: https://chromium-review.googlesource.com/1089207
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566639}
[modify] https://crrev.com/1789600ee46dd47e09fa43867cd2af19dfb97a09/chrome/browser/resources/settings/printing_page/cups_printers.html
[modify] https://crrev.com/1789600ee46dd47e09fa43867cd2af19dfb97a09/chrome/browser/resources/settings/printing_page/cups_printers.js

fixed a while ago, never closed bug