On the Content Manager Explorer of a SDL Web 8.1 instance I get an error when I use the "View on Site" button on any page.
On the same instance this button used to work.
I tried to close&open the browser, and tried on a different machine but the issue remains.
This is the error message from the browser console:
Uncaught ReferenceError: ko is not defined
at eval (/WebUI/Editors/Base/Libraries/Knockout/knockout.bindinghandlers.js:1)
at eval (<anonymous>)
at Function.globalEval (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:1)
at JsFileHandler._render (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:3)
at JsFileHandler.o.render (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:3)
at Function.o.renderWhenLoaded (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:3)
at eval (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:3)
at Object.eval (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:3)
at c (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:2)
at Object.fireWith (/SDL/Common/Library/Core/Packages/SDL.Client.Core.js:2)
/WebUI/Editors/Base/Libraries/Knockout/knockout.bindinghandlers.js:1
What could cause this issue?