Calibre-AI with Ollama: TypeError:can only concatenate str (not "list") to str

[m.s]

I can't get the AI summary with Ollama to work. Calibre is throwing this error message:

calibre, version 8.16.1
FEHLER: Unbehandelter Ausnahmefehler: <b>TypeError</b>:can only concatenate str (not "list") to str

calibre 8.16.1  embedded-python: True
macOS-26.1-arm64-arm-64bit Darwin ('64bit', '')
('Darwin', '25.1.0', 'Darwin Kernel Version 25.1.0: Mon Oct 20 19:32:47 PDT 2025; root:xnu-12377.41.6~2/RELEASE_ARM64_T8103')
Python 3.11.14
OSX: ('26.1', ('', '', ''), 'arm64')
Interface language: de
EXE path: /Applications/calibre.app/Contents/MacOS/calibre
Successfully initialized third party plugins: DeDRM (10, 0, 3) && Access Aide (0, 1, 15) && Check Books (0, 2, 0) && Count Pages (1, 14, 4) && DNB_DE (3, 2, 5) && Ebook Translator (2, 4, 1) && EpubSplit (3, 12, 0) && Find Duplicates (1, 10, 9) && Hyphenate This! (0, 1, 4) && Set KFX metadata (from KFX Output) (2, 18, 0) && KFX Output (2, 18, 0) && Mass Search-Replace (1, 8, 5) && Modify ePub (1, 8, 8) && PocketBook632 (1, 0, 2) && Pocketbook Collections (1, 2, 6) && Quality Check (1, 14, 6) && View Manager (1, 10, 3)
Traceback (most recent call last):
  File "calibre/gui2/llm.py", line 449, in on_chat_link_clicked
  File "calibre/gui2/dialogs/llm_book.py", line 214, in handle_chat_link
  File "calibre/gui2/dialogs/llm_book.py", line 220, in activate_action
  File "calibre/gui2/llm.py", line 349, in start_api_call
  File "calibre/gui2/dialogs/llm_book.py", line 235, in create_initial_messages
  File "calibre/gui2/dialogs/llm_book.py", line 53, in format_books_for_query
  File "calibre/gui2/dialogs/llm_book.py", line 44, in format_book_for_query
TypeError: can only concatenate str (not "list") to str

My AI settings are in attached screenshot.

[kovidgoyal]

https://github.com/kovidgoyal/calibr...066c0ea5971b79