Erro ao Compilar a Dll

Oct 13, 2014 at 5:18 PM
Boa Tarde pessoal,

Quando tento imprimir o boleto tenho a seguinte mensagem.
 Parser Error

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

Parser Error Message: Inheritance security rules violated by type: 'BoletoNet.BoletoBancarioDesigner'. Derived types must either match the security accessibility of the base type or be less accessible.
Alguém pode ajudar sobre esse erro ?

Obrigado