I am new to this group, but could use some collective wisdom. I built a Shiny app that has a simple user interface, dynamic text, and a plot_ly scatterplot. It works perfectly on my local servers. When I pushed it out to shinyapps.io, everything works correctly except that the plot_ly graph won't render. The error provided is one that I programmed custom, suggesting that there's an issue with the data. However, given that the dynamic text and interface work properly, I can rule that out. What is the best way to ferret out any little-known codicils that might interfere with rendering plot_ly on shinyapps but not on my local server? Note, the log says nothing about missing packages, and I've added graphics.off() and pdf(NULL).
The broken app can be found here: https://average-score-change.shinyapps.io/change_in_average_composite_score/