How can i resolve the following error in Matlab code in "main.m" file

Reference to non-existent field 'Area'. Error in main (line 71) area(i) = stats(i).Area;

[Rik]

Have a read here (or here for more general advice) and here. It will greatly improve your chances of getting an answer.

[Walter Roberson]

You used regionprops but you did not pass 'Area' to it.

Or, there is a path in your code in which the regionprops() is not done.