r - Error when trying to display dataframe using renderDataTable in Shiny -

i trying display dataframe using renderdatatable in shiny.

my server.r has following code:

output$table <- renderdatatable(  summaryactivitydt, options = list(orderclasses = true)   ) 

when run app, following alert box:

datatables warning: table id=datatables_table_0 - ajax error. more information error, please see http://datatables.net/manual/tech-notes/7

while debugging (based on url in alert box), came across following error:

dims [product 75] not match length of object [86] 

p.s. if replace calculated dataframe iris, works fine. however, not know what's wrong dataframe summaryactivitydt.

the posixlt causing issues. after changed column positlt chr, worked fine.

thanks everyone. hope others find useful.