Function in Shiny seems to need Java coversion

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I was scripting in the shiny server part and, after I used a function, I got this:

     converting an R function to JSON as null. To change this, define a method for toJSON() for a 'function' object.

and the server refuse to run the function. Reading into the issue I realize it is somehow related to java conversion of output. Is there a sensible way to resolve this? Thanks

asked 1 min ago

user3288485

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Function in Shiny seems to need Java coversion