[Instiki] Problem installing instiki-0.12 with ruby1.9

[Cecile]

Hi,

I'm on an ubuntu dapper machine and I'm having problems running instiki-0.12.
This is the error I'm getting:

me at ubuntu:/data/_bin/instiki-0.12.0$ ./instiki
/data/_bin/instiki-0.12.0/vendor/rails/activesupport/lib/active_support/core_ext/date/conversions.rb:12:in
`Kernel#send': private method `alias_method' called for Date:Class
(NoMethodError)
        from /data/_bin/instiki-0.12.0/vendor/rails/activesupport/lib/active_support/core_ext/date/conversions.rb:12:in
`included'
        from /data/_bin/instiki-0.12.0/vendor/rails/activesupport/lib/active_support/core_ext/date.rb:5
        from /data/_bin/instiki-0.12.0/vendor/rails/activesupport/lib/active_support/core_ext.rb:1
        from /data/_bin/instiki-0.12.0/vendor/rails/activesupport/lib/active_support/core_ext.rb:1
        from /data/_bin/instiki-0.12.0/vendor/rails/activesupport/lib/active_support.rb:31
        from /data/_bin/instiki-0.12.0/vendor/rails/activerecord/lib/active_record.rb:30
        from /data/_bin/instiki-0.12.0/vendor/rails/railties/lib/initializer.rb:166:in
`require_frameworks'        from
/data/_bin/instiki-0.12.0/vendor/rails/railties/lib/initializer.rb:166:in
`require_frameworks'        from
/data/_bin/instiki-0.12.0/vendor/rails/railties/lib/initializer.rb:87:in
`Rails::Initializer#process'        from
/data/_bin/instiki-0.12.0/vendor/rails/railties/lib/initializer.rb:47:in
`Rails::Initializer#run'        from
/data/_bin/instiki-0.12.0/config/environment.rb:4
        from script/server:55

Should I use ruby1.8 instead ?

Regards,

Gavin Bong