Dynamics Community Forum Thread Details

plugin error "Derived types must either match the security accessibility of the base type or be less accessible"

Hi,

I'm deploying a plugin which operates on a custom entity in Dynamics CRM 2013. When the plugin fires, it throws an error which I don't know how to analyze. Can you please suggest what to look for?

Error:

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Unexpected exception from plug-in (Execute): CRM2020.Plugins.FullNamePlugin: System.TypeLoadException: Inheritance security rules violated by type: 'Xrm.cust_import'. Derived types must either match the security accessibility of the base type or be less accessible.Detail:
<OrganizationServiceFault xmlns:i="">www.w3.org/.../XMLSchema-instance" xmlns="">schemas.microsoft.com/.../Contracts">
<ErrorCode>-2147220956</ErrorCode>
<ErrorDetails xmlns:d2p1="">schemas.datacontract.org/.../System.Collections.Generic" />
<Message>Unexpected exception from plug-in (Execute): CRM2020.Plugins.FullNamePlugin: System.TypeLoadException: Inheritance security rules violated by type: 'Xrm.cust_import'. Derived types must either match the security accessibility of the base type or be less accessible.</Message>
<Timestamp>2020-09-23T15:43:48.8295639Z</Timestamp>
<InnerFault i:nil="true" />
<TraceText>