I have an AirPlay error, how do I fix it?

Greetings Dilan727, 

Some questions that can help us, as a community, better help you. If there is an error message, what does it say? Which devices, other than your MacBook Air, are involved and at which end? What type of content are you attempting to AirPlay? 

Based on your picture, this article may provide some assistance - If screen mirroring or streaming isn't working on your AirPlay-compatible device. 

Thanks.