Hi Priyanka,
I have found the same errors than you have. Found the reason for the first; a bit late for you though...
For the first error you mention: you can't run the distribution directly from the Excel document that will be distributed. That's why when you do it from a new Excel workbook it works.
For the second error I still haven't found a solution. Sometimes, the Excel instance keeps on after the distribution is over and I have to force its shutdown.
I hope someone knows the solution.
J. Ignacio