This question is related [application loading without css](https://stackoverflow.com/questions/53995155/shiny-application-not-loading-with-graphics). I checked the java script console and get issues 

```
Uncaught ReferenceError: Shiny is not defined
    at (index):21

Uncaught ReferenceError: shinyjs is not defined
    at (index):39

```

The script at index 21 in source:

```
 `<script>Shiny.addCustomMessageHandler('shinyjs-show', function(params) { shinyjs.debugMessage('shinyjs: calling function "show" with parameters:'); shinyjs.debugMessage(params); shinyjs.show(params);})`;

```

The application is running on shiny-server on CentOs 6.