Thanks everyone very much

Despite my best efforts to fix the error from everyone's solution, I still can't fix it :<<

I have fixed all 3 ways below and it still doesn't work:

(1) Add both lines to odoo.conf:

wkhtmltopdf_path = "C:\Program Files\wkhtmltopdf\bin\wkhtmltopdf.exe"

bin_path = C:/Program Files/wkhtmltopdf/bin

(2) Delete line: wkhtmltopdf_path = "C:\Program Files\wkhtmltopdf\bin\wkhtmltopdf.exe"

(3) Delete line: bin_path = C:/Program Files/wkhtmltopdf/bin

Even when I downloaded from the latest version to version 0.12.5 of wkhtmltopdf, I still can't fix it :<<<

Not only me but my friends also have the same error with Odoo 19. But with Odoo 18, they all works fine and doesn't have this error.

Hi,

You can fix it by installing Wkhtmltopdf in your system .To  install Wkhtmltopdf by running the following command in your terminal:

    sudo wget

    https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.bionic_amd64.deb 

    sudo dpkg -i libssl1.1_1.1.1f-1ubuntu2_amd64.deb

Hope it helps.

1- Install the correct version for wkhtmltopdf for windows 
​https://wkhtmltopdf.org/downloads.html

2- add only this in odoo.conf file "this is the path for bin folder in wkhtmltopdf folder  that created after installation "
​bin_path = C:\Program Files\wkhtmltopdf\bin

Hello Nini,
Please remove  wkhtmltopdf_path and try below line in odoo.conf.

bin_path = C:\Program Files\wkhtmltopdf\bin