The Redmine installation information as below:

@Information

Redmine 2.3.3.stable

Default administrator account changed True
Attachments directory writable True
Plugin assets directory writable True
RMagick available (optional) True

Environment:
Redmine version 2.3.3.stable
Ruby version 1.9.3-p231 (2012-05-25) [i386-mingw32]
Rails version 3.2.13
Environment production
Database adapter Mysql2
Redmine plugins:
no plugin installed

Mantis Bug Tracker version: 1.2.15
@

I referred from this page's SQL coding (http://www.webismymind.be/upload/documents/migrate_from_mantis_1_2.sql), altered and update my Mantis database time format.

Also, I edited the migrate_from_mantis.rake script, connection seems fine on a fresh installed Redmine until I encounter this error:

"comparison of Fixnum with ActiveSupport::TimeWithZone failed"

Please advice me what is the error and what I have to edit on my migrate_from_mantis.rake script. See attachment for more information. Thank you.