Problem of state change with Workflow

The module Workflow works well with the module Views Bulk Operations for users of a role. This means the users can change workflow state of a node to next state with a bulk operations view.

But if users go to the workflow page by clicking the tab Workflow of a node, change its state, and hit Submit button, the users will get message responsed:

Access denied
You are not authorized to access this page.

And this node can't show up any more for users of the role. Only admin(user 1) can view it.