This error means that the Pixel Helper found what looks to be Facebook pixel code on your site, but the actual HTTP call was never made.
This could typically due to an error in the code, but could also occur if the pixel fires on a dynamic event (e.g. In that case, the error will disappear upon clicking on the button.
Next, using the Chrome browser install the Pixel Helper from the Chrome Store.
The popup will tell what pixels were found on the page, and whether they have loaded successfully.
If your pixel(s) loaded succesfully, it's time to start running ads with them. These states are indications that your webmaster needs to fix something in order to use the Facebook pixel product properly.
If one or more device has opted out each device will have to opt back in before tracking is enabled.
This warning suggests that the pixel is not paired with any product catalog.
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