It is solved... finally. I don't understand it but this is what I did.
I had created a subfolder called Challenge Files in the LaserTank
folder to hold two challenge file folder named Challenge-l and
Challenge-ll. I found that the font used in windows does not
distinguish between a upper case i and and a lower case L. I had used
a lower case L. All I did to fix the problem was change the folder
names to an upper case i and ii. At that point, everything started
working perfectly. I still don't understand it. ???????? But I'm not
going to argue with success.
Thanks again everyone.
Don