Problems in importing a large collection

I have a fairly large database in endnote (6600) that I would like to import to Zotero. I have tried using RIS and BibTex but they both fail with error message

An error occurred while trying to import the selected file. Please ensure that the file is valid and try again.

I did an error report and got this number.
1458954566

If it helps, I can publish the file.

Mikko

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