Negative distance in timcnt constructor

Hey people, the following error is currently preventing me from opening a session. Other sessions load up just fine. Any idea what to do?

Cannot initialize session/engine: Audio/MIDI engine not running or sample-rate mismatches.

–ERROR: unexpected exception during session setup: negative distance in timcnt constructor

File a bug report at https://tracker.ardour.org/ and attach the session file (*.ardour)

Okay. Will do. I’ve been away from the internet.