Problem when trying to append in outreg2

[Mary Arends]

I am using outreg2 to make a table with 5 regression results. I did this for one table with no problem--5 regression results, 6 columns. In the second table, when it got to the fifth regression, I got the error message
"file handle __00000I not found"

Here is the code I used:

reg qpe mm2 wage wagediff hagediff wmore_educ hmore_educ wprim wmed whs wcollege numg3 numg6 numg12 numg16 numg19 numg60 numg70 numg75 numb3 numb6 numb12 numb16 numb19 numb60 numb70 numb75 logpcthy wwork pystate pmaid2 pmean_prod pmean_ent pelet if q20hy==5, robust cluster(state)
outreg2 using "C:\Users\marends\Dropbox\DG (1)\log\regquint2.doc", append ctitle(Quintile 5)

I checked to make sure I had not opened the Word document. It was closed.

Thanks.