Looking for assistance with error message

[SRHKH]

This is the error message

Warning, unable to convert chapter 'Introduction' from 'https://bvtlabbook.com/book/7756' to valid XHTML. Your epub viewer may fail when viewing that chapter. You may need to fix the chapter manually with Calibre.
Conversion error message was: (This page contains the following errors:error on line 2055 at column 60: error parsing attribute name

Can anyone explain what is happening? I don't know how to you parse an attribute name with Calibre, so I may give up on this.

[dteviot]

@SRHKH

See: #192

It that's not enough, email me the offending XHTML file and I'll take a look at it.