Web Part Error: The control type 'System.Decimal' is not allowed on this page. Correlation ID: f77e6aa1-7934-e014-594a-39b3dbfd9093.

Web Part Error: The control type 'System.Decimal' is not allowed on this page. Correlation ID: f77e6aa1-7934-e014-594a-39b3dbfd9093.