> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/core/get-started/faq/viewer-showing-network-failure.md).

# Why is the viewer showing "Network Failure"?

World's #1 PDF SDK Library for Web, Mobile, Server, Desktop

This error likely means the initial document does not exist (we may have updated the SDK package). Try setting `initialDoc` to something like `https://pdftron.s3.amazonaws.com/downloads/pl/demo-annotated.pdf`

{% tabs %}
{% tab title="JavaScript" %}
{% code lineNumbers="true" %}

```js
WebViewer({
  path: '../../../lib',
  initialDoc: 'https://pdftron.s3.amazonaws.com/downloads/pl/demo-annotated.pdf'
}, document.getElementById('viewer'))
.then(function(instance) {
  // load the PDF from URL, Blob, Filesystem or Base64 data
  instance.loadDocument(e.target.value);
});
```

{% endcode %}
{% endtab %}
{% endtabs %}

which is a demo document online, or to another local PDF file on your system within the root directory tree for the project.


---

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```

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