None of the aforementioned solutions worked.  I went into the Paste from Excel screen and formatted the columns to match my spreadsheet.  I pasted 1292 rows in that screen and it worked.  So I now have my inventory in.  In case anyone reads this post for the same issue I had, don't bother with trying to get the import to work for Inventory parts (non-inventory parts worked fine).  Do the copy/paste option.