Errors when attempting to add a state to a new workflow

I have just downloaded the Workflow module and the Workflow_fields module (for 5.1). I've got it all installed and permissions set. But when I actually try to create a workflow I get these warnings when I try to create a state:

* warning: Invalid argument supplied for foreach() in c:\program files\apache group\apache\htdocs\drupal-5.1\sites\all\modules\workflow_fields\workflow_fields.module on line 59.

* warning: Invalid argument supplied for foreach() in c:\program files\apache group\apache\htdocs\drupal-5.1\sites\all\modules\workflow_fields\workflow_fields.module on line 87.

Is this normal? I'm too new to this to even know if Workflow is working or not. I'm not seeing any new fields in my content creation page.

Thanks.

Charles.