Error code -9998 Invalid number of channels

When I split a stereo track to mono and try to record using my interface (Focusrite) - I receive the -9998 error code. Please help!

This has worked before … no longer …

Problem details:

“timestamp”: 1708986727,
“event_id”: “1074cafbb76e41d0b8367332b81798d5”,
“platform”: “native”,
“release”: “audacity@3.4.2”,
“contexts”: {
“os”: {
“type”: “os”,
“name”: “Macintosh”,
“version”: “10.16.0”
“exception”: {
“values”: [
“type”: “Error”,
“value”: “Error opening recording device.\nError code: -9998 Invalid number of channels.”,
“mechanism”: {
“type”: “runtime_error”,
“handled”: false

How many channels are you trying to record? You can check that in Audio Setup → Recording channels

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