Silence/1 sound missing

Please see log below. The silence/1 file appears to be missing.

Executing [s@invalid-dest-cos:5] Playback("PJSIP/77412-0000000f", "silence/1&cannot-complete-as-dialed&check-number-dial-again,noanswer") in new stack
       > 0x7ff954038050 -- Strict RTP learning after remote address set to: 192.168.10.20:16886
       > 0x7ff9540f9fc0 -- Strict RTP learning after remote address set to: 192.168.10.20:16904
[2022-11-10 07:10:04] WARNING[1394026][C-0000000b]: file.c:824 ast_openstream_full: File silence/1 does not exist in any format
[2022-11-10 07:10:04] WARNING[1394026][C-0000000b]: file.c:1303 ast_streamfile: Unable to open silence/1 (format (ulaw|h264)): No such file or directory
[2022-11-10 07:10:04] WARNING[1394026][C-0000000b]: app_playback.c:513 playback_exec: Playback failed on PJSIP/DBM6413-0000000f for silence/1&cannot-complete-as-dialed&check-number-dial-again,noanswer
    -- <PJSIP/DBM6413-0000000f> Playing 'cannot-complete-as-dialed.ulaw' (language 'en')