Redmine

I'm not sure if it helps, but did you already clear the cache?

rake tmp:cache:clear
rake tmp:sessions:clear

afterwards you need to restart the application (web server)

hth

Hello, I did (just now) and the same error occures. A have attached a new file (with logs from Redmine log file and Redmine Exception Handler plugin error e-mail).

Ouch, this doesn't look good: (ActionView::Template::Error (Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')

Do you have any other special Plugins installed? What about the redmine_issue_templates Plugin?

Yes, that plugin is installed but it is not loaded as a module on that project. Should i try to remove it completely? This is my plugin list (but not all of them are loaded in that project)

Default Roles plugin
Extended fields
Redmine Periodictask plugin
Progressive Projects List plugin
Redmine Better Gantt Chart plugin
Redmine Charts Plugin
Redmine CMS plugin
Redmine CRM plugin
Redmine Dashboard plugin
Documents Short plugin
Redmine Exception Handler plugin
Redmine Extended Watchers plugin
Redmine Favorite Projects plugin
Redmine Attach Screenshot plugin
Redmine Issue Checklist plugin
Redmine Issue Templates plugin
Redmine Light Box plugin
MS Project/Redmine sync plugin
Redmine (Monitoring & Controlling | Monitoramento & Controle)
My Roadmaps plugin
Redmine People plugin
Redmine Q&A plugin
Related Buster
Redmine Todo Lists (Basecamp-like) plugin
Redmine Wiki Issue fields plugin
Scheduler plugin
Redmine Status
WikiNG Wiki Next Generation plugin

I have removed redmine_issue_templates Plugin but the problem is still there.