ggvis | Interactive grammar of graphics for R | Data Visualization library

I have the following dockfile

Can someone explain me why my shiny app works perfectly well locally but can't be deployed to shinyapps ?

When I deploy it to the server, the app loads and seems to be working fine until it turns a bit greyish with a warning message "disconnected from the server"...

I tried with different datasets but even with this minimal reprodutive example, I can't make the app work :/

Reprodutive example:

I am trying to create a simple app that does the following:

• Import a csv file as a reactive (this has to be a reactive)
• Print the contents of csv as data table in one tabPanel
• Create an interactive scatter plot using ggvis in another tabPanel

However I am unable to create the plot- the tabPanel where plot is supposed to appear is blank. There is no error or warning messages in the console whatsoever. Not sure what is wrong with the code.

Here is the code:

I am not able to get any points when I plot my ggvis. Please see my code below:

I am trying to build interactive multi-level sankey diagram using R. I can't find the solution how to assign the levels to nodes. For example, a1 node should be on the second level in chart but not in the fifth. It seems that the package assigns to the last node in the chain the rightmost position, which is not preferable in my case.

I tried different packages like echarts4r, networkD3, ggvis but it seems that these packages doesn't provide the functionality to manage levels in graph.

If you know how to solve this issue, please, share.

I have been working through some examples of statistical learning models via the ISLR package. The code is available here (https://rpubs.com/davoodastaraky/subset) so anyone can see. I also put it below for ease.

I have made an application on R shiny that I share with friends on the same network. I host the application on my remote computer and people connect to it using dedicated ports. I am trying to make a download button that saves a data.frame in an excel file and downloads the excel file in the user's computer. Currently, I am able to make the download button but it only writes the file to a folder in the remote server. I need help with the downloadhandler essentially. Thank you for your time. Here a csc reproducible example

I need to build a reproducible R installation from the command line. Seems easy enough, so I created a file with my package names of interest, for example

packages.txt:

This is an issue with ggvis, fill and layer_bars. I'm trying to run the following code, and it doesn't work. Replacing my data by Iris seems to solve it, but I can't find why. I also tried, as suggested on some posts, to add a group_by .. but it was not better. Any suggestion would bu welcomed !

The error I get is:

ERROR : object 'coul' not found

Here is a code :