3D plot from Excel data "delaunay" function

Hello I'm trying to plot a 3D surface using the following function to import the data from excel as vectors:

function reg1(x,y,z) test = xlsread('rectag1.xls', 'F10:H2711'); x=test(:,1); y=test(:,2); z=test(:,3); tri = delaunay(x,y); trisurf(tri,x,y,z); end

I've used it before with similar range of data and it has worked, nevertheless this time I get this warning:

Error using delaunay The input points must contain finite values; Inf and NaN are not permitted.

Please could someone help me out to better understand the issue?