Redmine

My team has updated the redmine from an old edition to 1.1.0, but when we finished the updating comes a problem. When we login and click our login name on the upper-right corner there will be an internal error, so as while we click a member in a project, and we still don't know why.
Here is error message:
Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your redMine administrator for assistance.
Wish someone could help soon, thx.