Error while opening GnuCash file

[Karen Marysdaughter]

I've been using GnuCash for over a year for a couple different accounts.  Today one of the accounts opened fine, but for the other one I get this error message:  "There was an error parsing the file" and it won't open.  I have no idea how to deal with this.  Any suggestions?

Karen Marysdaughter, 350 Maine
karenmd at myfairpoint.net
525-4538 (home)
930-5440 (cell)