How to resolve Dynamics CRM Plugin System.Security.Permissions.FileIOPermission error

Question

Business Process Error System.Security.SecurityException: Request for the permission of type \'System.Security.Permissions.FileIOPermis

Answer 1

If your plugin is registered in sandbox then this could be the problem. Try to register it outside of the sandbox. Here you can find information about trust levels

Answer 2

Reading file from a sandbox plugin is prohibited. Try to change isolation mode to none.