When attempting to convert certain KFX formatted books - not all - I'm getting errors of the kind shown below. Latest KFX plugging installed.
Argel
calibre, version 8.1.1
ERROR: KFX conversion failed: <p><b>[book name redacted]</b><br><br>Exception('box-align right with float right in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align left with float left in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /c60.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align left with float left in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align left with float left in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align left with float left in /cWH.xhtml\nbox-align left with float left in /cWH.xhtml\nbox-align left with float left in /cWH.xhtml\nbox-align left with float left in /cWH.xhtml\nbox-align left with float left in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml\nbox-align right with float right in /cWH.xhtml')</p>