@@ -58,6 +58,26 @@ The maximum allowed file size for uploads is currently set to 2.5MB.
Ensure that the file size is under 2.5MB before attempting to upload it.
## Exercise cannot be started after outage
### Issue
Cannot start an exercise even though all exercises are stopped.
### Cause
When an exercise is running, a special lockfile is created.
This lockfile is deleted automatically when the exercise is stopped.
If the backend server crashes or the server is manually stopped during a running exercise,
this file will not be properly deleted, preventing from starting this specific exercise again.
The server is set up to automatically delete all lockfiles on startup.
However, if this issue persists even after restarting the server,
it could be possible that the process failed.
Ensure that no lockfiles are present in the `data` directory with the name `exercise-<ID>.lock`.
The `data` directory is located in the base directory of the backend.
These files can be deleted while the server is running,
however only if there are no actual running exercises.
## Conclusion
If you require further assistance, don't hesitate to report issues to us. The [Report issue](report-issue.md) page includes instructions on how to report bugs.
