Why does not my pixel work on iOS 14 or higher?

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I get this error message when i try to make ads on facebook:

The catalog is not connected to any pixels with events configured for ad optimization with iOS 14.5+ on any domain. This may result in lower delivery or reporting for individuals using devices with iOS 14.5 or later. You can review the pixels connected to the catalog in Business Manager. Go to Business Manager.

Please help me!