Some more info:
command logs
/usr/sbin/vzctl start 101
Starting container ...
vzquota : (warning) Incorrect quota shutdown for id 101, recalculating disk usage
vzquota : (error) quota check : lstat `sess_1c7d0cab3baa429af3a6a632785c40ec': No such file or directory
vzquota on failed [1]
VM 101 start failed -
INIT LOG
starting init logger
* Setting preliminary keymap... [ OK ]
* Starting basic networking... [ OK ]
* Loading kernel modules... * Loading manual drivers... [ OK ]
* Setting kernel variables... [ OK ]
* Activating swap... [ OK ]
mount: permission denied
* Mounting local filesystems... [ OK ]
* Activating swapfile swap... [ OK ]
* Checking minimum space in /tmp... [ OK ]
* Skipping firewall: ufw (not enabled)... [ OK ]
* Configuring network interfaces... [ OK ]
* Starting system log daemon... [ OK ]
* Starting OpenBSD Secure Shell server sshd [ OK ]
* Starting MySQL database server mysqld [ OK ]
* Checking for corrupt, not cleanly closed and upgrade needing tables.
* Starting ClamAV virus database updater freshclam [ OK ]
* Starting internet superserver inetd [ OK ]
* Starting Postfix Mail Transport Agent postfix [ OK ]
* Starting deferred execution scheduler atd [ OK ]
* Starting periodic command scheduler crond [ OK ]
* Starting web server apache2 [ OK ]
* Running local boot scripts (/etc/rc.local) [ OK ]