I'm getting the following bug when I try to run rake db:migrate in
Rails 3 beta 4:

$ rake db:migrate --trace
(in C:/Users/Adam/Documents/Aptana Workspace/QuestionBank)
default formats are encoded in ISO-8859-1
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:migrate
==  CreateUsers: migrating
====================================================
-- create_table(:users)
rake aborted!
An error has occurred, all later migrations canceled:

undefined method `<=>' for class `ActiveSupport::Multibyte::Chars'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.beta4/lib/
active_support/multibyte/chars.rb:49:in `<class:Chars>'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.beta4/lib/
active_support/multibyte/chars.rb:36:in `<module:Multibyte>'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.beta4/lib/
active_support/multibyte/chars.rb:6:in `<module:ActiveSupport>'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.beta4/lib/
active_support/multibyte/chars.rb:5:in `<top (required)>'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/abstract/quoting.rb:13:in `quote'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/mysql_adapter.rb:196:in `quote'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/abstract/schema_statements.rb:450:in
`add_column_o
ptions!'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/abstract/schema_definitions.rb:
286:in `add_column_
options!'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/abstract/schema_definitions.rb:
279:in `to_sql'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/abstract/schema_definitions.rb:
529:in `map'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/abstract/schema_definitions.rb:
529:in `to_sql'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/abstract/schema_statements.rb:117:in
`create_table
'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/connection_adapters/mysql_adapter.rb:442:in
`create_table'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:356:in `block in method_missing'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:332:in `block in say_with_time'
c:/Ruby191/lib/ruby/1.9.1/benchmark.rb:294:in `measure'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:332:in `say_with_time'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:352:in `method_missing'
C:/Users/Adam/Documents/Aptana Workspace/QuestionBank/db/migrate/
20100715154624_create_users.rb:3:in `up'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:285:in `block in migrate'
c:/Ruby191/lib/ruby/1.9.1/benchmark.rb:294:in `measure'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:285:in `migrate'
c:0:in `migrate'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:510:in `block (2 levels) in migrate'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:586:in `call'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:586:in `ddl_transaction'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:509:in `block in migrate'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:496:in `each'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:496:in `migrate'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:406:in `up'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/migration.rb:388:in `migrate'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/activerecord-3.0.0.beta4/lib/
active_record/railties/databases.rake:140:in `block (2 levels) in <top
(required)>'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:636:in
`call'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:636:in
`block in execute'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:631:in
`each'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:631:in
`execute'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:597:in
`block in invoke_with_call_chain'
c:/Ruby191/lib/ruby/1.9.1/monitor.rb:190:in `mon_synchronize'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:590:in
`invoke_with_call_chain'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:583:in
`invoke'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2051:in
`invoke_task'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2029:in
`block (2 levels) in top_level'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2029:in
`each'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2029:in
`block in top_level'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2068:in
`standard_exception_handling'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2023:in
`top_level'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2001:in
`block in run'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:2068:in
`standard_exception_handling'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/lib/rake.rb:1998:in
`run'
c:/Ruby191/lib/ruby/gems/1.9.1/gems/rake-0.8.7/bin/rake:31:in `<top
(required)>'
c:/Ruby191/bin/rake:19:in `load'
c:/Ruby191/bin/rake:19:in `<main>'


There's nothing fancy in the migration files as far as I can see, just
a very basic table setup. I've tried this with ruby 1.8.7, 1.9.1 and
1.9.2, and using both mysql and sqlite. Any ideas?

Adam

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