Error opening AUP3 file

Audacity: 3.1.2
Mac OS: 12.0.1

The problem is experienced only with one file, all other ones work OK.
See attachment for the error message.

How can I fix it?

Problem details:

“timestamp”: 1639753997,
“event_id”: “2a7bb91f30e24eb798ebfcdbe0e47a3b”,
“platform”: “native”,
“release”: “audacity@3.1.2”,
“contexts”: {
“os”: {
“type”: “os”,
“name”: “Macintosh”,
“version”: “10.16.0”
“exception”: {
“values”: [
“type”: “Internal_Error”,
“value”: “Internal error at / line 547.\nPlease inform the Audacity team at https://.”,
“mechanism”: {
“type”: “runtime_error”,
“handled”: false
Capture d’écran, le 2021-12-17 à 10.06.53.png

Please see this forum post for the solution:

It worked, thanks!