Depict an abstract representation of Nikita's geometric endeavour to construct an angle bisector. She commences with two intersecting lines at a point forming an angle. She then places a compass on the intersection, creates an arc which intersects the two rays. The compass is moved to the intersections formed with rays and new arcs are created inside the angle which further intersects. Lastly, she draws a line connecting the intersection of angles to the original intersection point. However, there is an error in one of these steps. Do not include any text on the image.

In constructing angles, what common mistakes are often made by students and how can they be avoided?