Error while launching sftool

When I try to lauch sfttol, I get the error below.

What shall I do ?

Note : The current version of Java on my computer is 6-39 (build 1.6.0_39-b04). I don't know if it has been recently changed.

>> sftool

??? Error using ==> addlistener C:\Program Files\MATLAB\R2010b\toolbox\matlab\uitools\private\javaaddlistener.m: Can't open file.

Error in ==> Group>Group.Group at 37 this.InternalListeners = [

Error in ==> sftool>sftool.sftool at 55 h.Group = sftoolgui.Group(h);

Error in ==> sftool at 36 h = sftoolgui.sftool;