It would be easier for you and those prepared to help if you used strict and warnings and declared all your variables.

I was able to run your script without error (although I didn't have an excel file handy with any chart objects, so the inner for loop wasn't touched).

I didn't get the error you show above with excel 2003.

testw.txt contained:

983882
 => The operation completed successfully.
[download]

update: corrected typo