Error when using the Securely displaying pdf documents code

[johnwbaxter]

Hi, when I try this code I get the error:

Unknown "version" function.

https://github.com/cooltronicpl/Craft-document-helpers#securely-displaying-pdf-documents-in-the-browser-without-saving-to-the-web-folder

[cooltronicpl]

You can use this:

    {% set pdfOptions = {
        date: entry.dateUpdated|date('U'),
     } %}
                {% header "Content-Type: application/pdf" %}
{{craft.documentHelper.pdf('_pdf/document.twig', 'inline', '../book_example'  ~ '.pdf', entry, pdfOptions)}}

Or install Static Files Autoversioning, because it is a function from this plugin. If it is working fine, please let us know. We used the attached code without an external plugin and version function on the website. This example works now in our test environment.