Invoice PDF Download

I successfully installed the app on Valet (windows version) and all features that I have tested works fine except the PDF Download of the invoice. I produces the "504 Gateway Time-out".

What may be the cause of this issue?

<p>I successfully installed the app on Valet (windows version) and all features that I have tested works fine except the PDF Download of the invoice. I produces the "504 Gateway Time-out".</p><br /> <p>What may be the cause of this issue?</p>

After installing the app onto Apache Webserver, it worked fine. I suppose there is an issue with Valet that would not figure out.

<p>After installing the app onto Apache Webserver, it worked fine. I suppose there is an issue with Valet that would not figure out.</p>