Instance Setting 'Save' and 'Cancel' buttons are missing

• Type: Regression Bug
• Status: Closed
• Resolution: No Longer Reproducible
• Affects Version/s: Master
• Fix Version/s: Master
• Component/s: Image Auto Tagging, Portal Configuration > Portal Settings
• Labels:
  • 7.2-must
• Fix Priority: 4
• Sprint: U&SM | S02 Sprint 16

Steps to reproduce:

1. Navigate to Instance Settings

Expected Result:
'Save' and 'Cancel' buttons are both visible.

Actual Result:
Neither button is visible. Console error happens upon navigating to Instance Settings.

03-Apr-2019 18:08:57.883 SEVERE [http-nio-8080-exec-3] org.apache.catalina.core.ApplicationDispatcher.invoke Servlet.service() for servlet [jsp] threw exception
 java.lang.IllegalArgumentException: com.liferay.document.library.asset.auto.tagger.opennlp.internal.servlet.ui.OpenNLPDocumentAssetAutoTagProviderCompanySettingsFormNavigatorEntry is not an interface

Tested on:
Tomcat 9.0.10 + MySQL 5.7.25
Portal master SHA: 6078ef910f410f601a1079dcbe65016232fe2f43