Just encountered with the same error.
The reason is that queue.php
file (which is responsible for queued emailing and contains serialized string representing a queue of emails) gets truncated in the middle of serialized string.
Usually it happens because you have no disk space or your disk quota does not your executables to write more data on disk.
So, if you have the same error:
- Check the end of this file
- Ensure you have enough disk space or not at the limit of quota.
- Either heal the file (by fixing serialized string and adding trailing part of PHP script) or delete it completely (phpBB will recreate it) — in the latest case you lost some of queued email messages.