javascript - D3: Uncaught TypeError: Failed to execute 'insertBefore' on 'Node': parameter 1 is not of type 'Node' -


trying figure out causing error in d3 code. here code snippet:

// add warning box if value exceeded      mychart.append("g")          .data(data)         .enter().append(function(d) {    // error on line of code                    if (d.days >= 20) {                 d3.select("#chart").append('div')                 .attr('class','redbox')             }                   ;})

here error:

uncaught typeerror: failed execute 'insertbefore' on 'node': parameter 1 not of type 'node'

i'm new d3, or direction can provided appreciated. should mention renders , want, error.


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