Macintosh Manager, Mac OS 8.1: "Unable to Start the Requested Environment" Message

Use this solution for an issue, sometimes called "looping login," in which Macintosh Manager returns you to the login screen after displaying an alert message.
Symptom

After logging in to Macintosh Manager, an alert box with this message appears:

You are logged out and returned to the login screen.

Products affected

Note: Mac OS versions prior to 8.1 are not supported by Macintosh Manager 2.0 or later.

Solution

There are several possible solutions:

If the issue persists, refer to article 58820: "Macintosh Manager: Client Login Troubleshooting".
Published Date: Feb 17, 2012