I add some new .m file to /usr/local/Wolfram/Mathematica/9.0/AddOns/Packages/
and then call for it in Mathematica, but failed with the message Get::noopen: "Cannot open \!\(\"Qdensity.m\"\)."
.
What should I do to make it work?
I add some new .m file to What should I do to make it work? 

