[exy]

Conversion fails with following error for one book. is there any solution?
Latest Calibre and plugins on Win.


WARNING: This book contains PDF content, which can be extracted using the KFX Input plugin CLI.
ERROR: This book has a layout that is incompatible with calibre conversion. For best results use the KFX Input plugin CLI for conversion.
Converting book to EPUB 3
Format is fixed layout
Traceback (most recent call last):
File "calibre_plugins.kfx_input.__init__", line 115, in convert
Exception: This book has a layout that is incompatible with calibre conversion. For best results use the KFX Input plugin CLI for conversion.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "runpy.py", line 196, in _run_module_as_main
File "runpy.py", line 86, in _run_code
File "site.py", line 83, in <module>
File "site.py", line 78, in main
File "site.py", line 50, in run_entry_point
File "calibre\utils\ipc\worker.py", line 215, in main
File "calibre\gui2\convert\gui_conversion.py", line 38, in gui_convert_override
File "calibre\gui2\convert\gui_conversion.py", line 25, in gui_convert
File "calibre\ebooks\conversion\plumber.py", line 1108, in run
File "calibre\customize\conversion.py", line 242, in __call__
File "calibre_plugins.kfx_input.__init__", line 126, in convert
calibre.ebooks.conversion.ConversionUserFeedBack: {"msg": "<b>Cannot convert ABC - X : Pqr stu vwxyz</b><br><br>Exception('This book has a layout that is incompatible with calibre conversion. For best results use the KFX Input plugin CLI for conversion.')", "level": "error", "det_msg": "", "title": "KFX conversion failed"}