Shiny app not launching after R/Rstudio and pkgs upgrade

[Gunjan]

Getting the following error after launching Shiny app after R/Rstudio and pkgs upgrade.The app was working fine all this time.

Error in get(name, envir = asNamespace(pkg), inherits = FALSE) :

object '%OR%' not found

[nirgrahamuk]

Could you make a reproducible example?

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Shiny issues can be challenging to resolve relative to other problems with your code or statistical methods. Shiny apps are often large, complex projects with interacting files. When seeking help from others it is considered polite to: First, do your best to work through RStudio's debugging tools to diagnose your issue on your own. Often those shiny logs and tracebacks are useful to others trying to help out. Second, strive to minimize the effort required to replicate your issue. You can do this with a reproducible example ("reprex"). Shiny Debugging Errors in Shiny code can be difficult to track down. If you don't know where your problem is coming from, you can track it down with some o…

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[Gunjan]

I think the error message points to this part of my code ---

%then% <- shiny:::%OR% #create a %then% operator for shiny::validation to display one validation error message at a time

I understand that %OR% is an internal object of shiny .maybe not present in the new versions.
I go back to the old version and get this.

shiny:::%OR%
function (x, y)
{
if (is.null(x) || isTRUE(is.na(x)))
y
else x
}

But how to get my app working in the new versions which are as follows:

• New R version 3.6.3
• New R-studio Version 1.3.1093

Even replacing the code like this is not helping me lauch the app.

%then% <- function(a, b) {
if (is.null(a)) b else a
}

[nirgrahamuk]

this must be related to mismatched shiny versions
%OR% doesnt exist in 1.6, it was removed
Replace %OR% with %||% from rlang (#3172) · rstudio/shiny@e44a9b1 (github.com)