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This is probably the relevant bit of the detailed log:

Decompressing text section 157
Converting text to OEB...
Reading text from file...
Detected input encoding as ISO-8859-2 with a confidence of 88.3062301073%
Auto detected paragraph type as block
Auto detected formatting as markdown
Running text through markdown conversion...
Python function terminated unexpectedly
child index out of range (Error Code: 1)
Traceback (most recent call last):
File "site.py", line 132, in main
File "site.py", line 109, in run_entry_point
File "site-packages\calibre\utils\ipc\worker.py", line 191, in main
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 31, in gui_convert_override
File "site-packages\calibre\gui2\convert\gui_conversion.py", line 25, in gui_convert
File "site-packages\calibre\ebooks\conversion\plumber.py", line 963, in run
File "site-packages\calibre\customize\conversion.py", line 208, in __call__
File "site-packages\calibre\ebooks\conversion\plugins\pdb_inp ut.py", line 32, in convert
File "site-packages\calibre\ebooks\pdb\palmdoc\reader.py", line 73, in extract_content
File "site-packages\calibre\ebooks\conversion\plugins\txt_inp ut.py", line 169, in convert
File "site-packages\calibre\ebooks\txt\processor.py", line 106, in convert_markdown
File "site-packages\calibre\ebooks\markdown\markdown.py", line 391, in convert
File "site-packages\calibre\ebooks\markdown\blockparser.py", line 60, in parseDocument
File "site-packages\calibre\ebooks\markdown\blockparser.py", line 75, in parseChunk
File "site-packages\calibre\ebooks\markdown\blockparser.py", line 92, in parseBlocks
File "site-packages\calibre\ebooks\markdown\blockprocessors.p y", line 295, in run
IndexError: child index out of range