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Error in validateBoxProps(title = title, label = label, sidebar = sidebar,  :is.numeric(width) is not TRUE

Has anyone seen this code while trying to run a Shiny app? It appeared when I started using library(shinydashboardPlus) and specifically the dropdownBlock command. I cannot find the trigger and the error sometimes disappears if I force kill R and rerun but has made my app very unstable.

Ronak Shah
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Michael Grammatikopoulos
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  • without code, it's hard to say how this error got generated. looks like something is not right with `:is.numeric(width) is not TRUE`, what happens if you remove that code from your code? – Daniel_j_iii May 07 '21 at 20:03
  • I understand, unfortunately I cannot share anything from the source code. There is no validateBoxProps nor an is.numeric test in the code. And what is mostly surprising is that i cannot seem to find anything on Google regarding that which is nearly impossible. – Michael Grammatikopoulos May 07 '21 at 20:58

2 Answers2

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I get the same error since a couple of days. For reasons I do not understand, setting the width option of a box to "100%" doesn't work anymore. If you defined the width of a box in your code, try setting it to (a fraction of) 12. From the help:

The width of the box, using the Bootstrap grid system. This is used for row-based layouts. The overall width of a region is 12, so the default valueBox width of 4 occupies 1/3 of that width. For column-based layouts, use NULL for the width; the width is set by the column that contains the box.

Tim Ka
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  • This fixed the error for me. Specifically I has some `tabBox(width = "100%")` in my code which I changed to `width=12` – Mxblsdl Dec 04 '21 at 05:42
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Use shinydashboard::box that seems to fix the issue

J Weber
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