This content can’t be played on this Apple TV

If you hold down the Menu button and the down arrow on the remote for 10 sec until the LED on the front of the Apple TV begins to flash. Let go of the buttons and the Apple TV will do a soft reboot.
This has been happening to me several times a week and doing this seems to fix the issue.

Problem identified. My machine only runs 32-bit at the moment. The latest versions of Tiled are 64-bit, and Gideros is all 64-bit. After a redownload and some minor glitches, Pixen seems to work fine. I downloaded an operational albeit outdated version of Tiled in the mean time. I really need to upgrade to 64-bit. I guess I overreacted when all three had the same error, and indeed Pixen shouldn't have had the error (and no longer does). I didn't anticipate that Tiled would be 64-bit either. Oh well. Thanks for any and all input.