Redmine

I install redmine by using one-click install solution——bitnami redmine,the installation is really easy,and after installation,i can open the redmine(http://localhost/redmine).

But when i restart the computer,the redmine can't be opend anymore,it reply the error like this:
*"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.

If you are the Redmine administrator, check your log files for details about the error.

Back"*

if anyone know how to solve the problem,thanks a lot!