airplay mirroring not working on the latest update of Sierra

After I updated my laptop macOS sierra to the latest update (ver 10.12.3) it isnT mirroring with lonely screen.

The lonely screen shows as an airplay and though it connects with the airplay server but nothing comes on it.

Lonely screen is a screen mirroring application.

The lonely screen is installed on my iMac which has an older version OS (10.9.5).

I doNT want to upgrade it as it is stable with this version and the specs it has might just really slow it down with later versions.

It used to work pretty smoothly till before the installation.

Lonely screen is able to mirror from my iPhone still,

but not the laptop, somehow….

please help.

thanks

ujjwal