There are (at least) two things that show issues:
2018-05-30 12:39:01 [DEBUG] updater.py(76) __init__(): Cannot not find /usr/share/cnchi/update.info file. Cnchi will not be able to update itself.
2018-05-30 14:03:03 [ERROR] pac.py(164) finalize_transaction(): Can't finalize alpm transaction: transaction failed, pm_errno 34 (invalid or corrupted package), 
If I read this correctly, the first one prevents cnchi updating itself to the version that has already fixed the second.
Maybe you can manually try to update cnchi in the beginning and restart the install.
So at start, just close the cnchi window, start a terminal, and give the following command in the terminal:
sudo pacman -S cnchi
then restart cnchi from its icon (if terminal shows no errors).
Please report issues including all details! ;-)
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