quadrat.test()

Hello,  I stumbled upon an respones you write regarding the quadrat()  
function in R.  I have been manhandling it all day and I still cannot  
get quadrat() or quadrat.test() to work for me.  I keep getting this  
errror:

Error in quadrat.count.engine(X$x, X$y, b$xbreaks, b$ybreaks) :
         xbreaks do not span the actual range of x coordinates in data

Does this mean anything to you?  I am at a total loss.

Thank You,

Erin K.