I can help you with the OnTime issue since I am the author. I need to know what version of OnTime you are running and it would be helpful to see your /ontime/config.yml
On first glance it looks like you have a bad piece of data in our MySQL database. So the next thing I will Lilly need you to do is to turn on OnTime logging, and then have you post the resulting /ontime/OnTimeLog.txt file. There is an enable in the config.yml to turn on logging and you would need to set the logging level to "1".
In the future when you see errors like this your best bet is to post on the bukkitdev page for this or any other plugin. I just happened to stumble across this.
Edge