WTP Server cannot be saved - Custom Availability Zone option not supported for VPC environments

[sgun6407]

When opening my AWS Elastic Beanstalk environment in the WTP Server editor, the error message "[Advanced] PreferredStartTime must match the regular expression ..." is displayed:

If I change the date format for example from "Wed:14:00" to "WED:14:00" in field "PreferredStartTime" as in the screenshot and try to save the configuration, the error message "The server cannot be saved for the following reasons: [Advanced] Invalid option value: " (Namespace: 'aws:ec2:vpc', OptionName: 'Custom Availability Zones'): Custom Availability Zones option not supported for VPC environments..

Eclipse and AWS Toolkit installation details: