MolSearchExample.java cannot find Util?

I am compiling MolSearchExample.java and it says:

MolSearchExample.java:54: cannot find symbol

symbol  : variable Util

location: class search.MolSearchExample

                        new FileInputStream(Util.addPath("t.mrv")));

                                            ^

MolSearchExample.java:80: cannot find symbol

symbol  : variable Util

location: class search.MolSearchExample

                        System.out.println(Util.dumpIntArray(hit));

                                           ^

MolSearchExample.java:90: cannot find symbol

symbol  : variable Util

location: class search.MolSearchExample

                        System.out.println(Util.dumpInt2DArray(hitAll));

                                           ^

3 errors

It seems that moving the two files to a new directory and changing the package name (to the new directory) seems to have fixed this compilation problem.