Value of Attribute "Class" is Invalid Error
When trying to upload to Smashwords everything worked except for one error in .epub format.
ERROR: tyrannosaur-faire.epub/tmp_ded79451e6cdf468341bacf6042b5951_3UfrAW.ch.fix ed.fc.tidied.stylehacked.xfixed_split_015.html(20) : value of attribute "class" is invalid; must be a list of XML NMTOKENs
Can someone please tell me what this means and how to correct it?
Thanks.
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