AirDrop used to work between my iMac and MacBook Pro. Now, when I try to transfer a file (either direction) I get a message that my certificate is invalid or that the file has not been accepted. What do I do?

AirDrop used to work between my iMac and MacBook Pro. Now, when I try to transfer a file (either direction) I get a message that my certificate is invalid or that the file has not been accepted. What do I dot correct this?

Message was edited by: leroydouglas
better yet, try this solution:
https://discussions.apple.com/message/12351186#12351186

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