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This is because, you are using deprecated properties (used in ChartJS 1.x) for setting colors. Use the following properties instead (which is applicable for ChartJS 2.7) :
datasets: [{
label: 'Dique Las Maderas',
fill: false,
borderColor: "#bae755",
borderDash: [5, 5],
backgroundColor: "#e755ba",
pointBackgroundColor: "#55bae7",
pointBorderColor: "#55bae7",
pointHoverBackgroundColor: "#55bae7",
pointHoverBorderColor: "#55bae7",
data: valor
}]
Source:stackexchange.com