Cannot assign the color to the legend

[sreenumalae]

Hello guys,
I'm trying to plot a pie chart where i have N number rows of data.
When i plot that half of my pie chart looks black that's one of the issue and my main issue is im not able to assign colors for those N legends
Here u can see my pie chart along with legends
In legends it has color for first four. where for those four i manually assigned the color

How can i assign color for all the legends where it should match with pie chart.