You can refer to the reasons and solutions for your issue at the following link: "https://stackoverflow.com/a/79163054/28591255". I’ll also provide some additional insights to enhance the solution further. I will change: "RUN chmod -R 755 /app/Rotativa/" to "RUN mkdir -p /app/Rotativa/Linux &&
mv /usr/local/bin/wkhtmltopdf /app/Rotativa/Linux/ &&
chmod 755 /app/Rotativa/Linux/wkhtmltopdf"

Good luck for you!