Web Part Error: The control type 'System.Decimal' is not allowed on this page. Correlation ID: 56be8ba1-c90f-e014-6eb5-316d4c841b0d.

Web Part Error: The control type 'System.Decimal' is not allowed on this page. Correlation ID: 56be8ba1-c90f-e014-6eb5-316d4c841b0d.