Redmine

Dear,

Occur below error when I try to access on editing user and settings in administratio

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

Information

Redmine 3.4.3.stable
Environment:
  Redmine version                3.4.3.stable
  Ruby version                   2.2.5-p319 (2016-04-26) [x86_64-linux]
  Rails version                  4.2.8
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.7.14
  Filesystem                     
Redmine plugins:
  no plugin installed

Could you help me solution to resolve it asap.

Thank you!