Error in Graphics, Brushes With Freebrush

Following the code through the 'Polyline Pen: Tracking the Mouse' in Graphics section, and I'm getting this error:
"No matching member function for call to 'curveTo'"

for the following bit of code
`currentPolyline.curveTo(mousePos);  // Here we are using an ofVec2f with curveTo(...)`

ofNewb here btw, would like to start contributing more to OF. Let me know the best way to help!