Error shows in R Shiny App in Hospital Readmission project

[irenemrqt]

Recently, when accessing the R Shiny App deployed in the Hospital Readmission Project, there is an error when clicking on the "Predict Re-Admission" button that states: 'getCurrentTheme' is not an exported object from 'namespace:shiny.

I enclose an error of the error shown. This error happened suddenly since previously was working so it might be a library update that is not compatible with the current code.