Java Script Error After Enable Unified Interface (on-premises) V 9.1

After Use the new Unified Interface only (recommended) to Yes And Reloading and reloading the page, I get the following error :

"ReferenceError: LCIDUtils is not defined
at ">crm.ZZZZ.com/.../app.js

I disabled the language in Crm and tested again, but it gave the above error again.

app.js Error Line Is :

if (typeof (LCIDUtils) == "undefined") {
   LCIDUtils = {} // Error
}