Attempt to apply non-function when showing Rickshaw graph?

[tcash21]

runGist("https://gist.github.com/tcash21/6234591")

As soon as I switched from renderPrint() and showing text to renderChart2() and showing a chart, I receive an 'attempt to apply non-function' error on startup. Any ideas how I can get rid of that error?

[ramnathv]

I am unable to reproduce the error, and the chart shows up fine for me. I have been making frequent changes to rCharts, so can you try installing the dev branch from github and trying again to see if the error persists?

[tcash21]

Just installed the dev branch and ran the gist again and I am able to produce the plots fine. However, in the console I see "Listening on port 8100
Error in eval(expr, envir, enclos) : attempt to apply non-function"

[timelyportfolio]

I think that is a shiny issue. Try to install the newest shiny with the rstudio CRAN.

Kent

On Aug 14, 2013, at 5:08 PM, tcash21 notifications@github.com wrote:

Just installed the dev branch and ran the gist again and I am able to produce the plots fine. However, in the console I see "Listening on port 8100
Error in eval(expr, envir, enclos) : attempt to apply non-function"

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[stanstrup]

I am having the same issue. Was any cause found? I get the error when the inputs (two selectInput) have not yet been set.
This happens even if I catch the missing input and doing "return(NULL)" inside renderChart2. Could it be that showOutput doesn't like to be feed NULL?

btw this is not Rickshaw specific. I am using highcharts.

[stanstrup]

Ok I have confirmed the nature of the bug. If Instead of return NULL I do:

if(is.null(input$explore_sys2)) {p<-hPlot(y ~ x, data = data.frame(x=1,y=2), type = "scatter");return(p)}

The error disappears. So showOutput doesn't handle NULL like uiOutput.
Can this be fixed or is there something else we can return to not display an output?

EDIT: Highcharts$new() can be returned instead of NULL.

[sachinrawat1903]

I am getting the same error.
and yes it's because i am returning null if the is input is null.
renderchart() function can't handle it.
Is there any solution available?