Web Part Error: The control type 'System.Decimal' is not allowed on this page. Correlation ID: 1c1d8fa1-5921-e014-6eb5-39c143b340a2.

Web Part Error: The control type 'System.Decimal' is not allowed on this page. Correlation ID: 1c1d8fa1-5921-e014-6eb5-39c143b340a2.