Found more than one concrete type for given DbContext type (xxx.xxxx.xxx) define Multitenancysideattribute with Tenant

Error message:

Found more than one concrete type for given DbContext type (Abp.Zero.EntityFramework.AbpZeroCommonDbContext ' 2[ Easyman.authorization.roles.role,easyman.users.user]) define Multitenancysideattribute with Tenant. Found Types:Easyman.EntityFramework.EasymanDbContext, Easyman.entityframework, version=1.0.0.0, Culture=neutral, Publickeytoken=null, Easyman.EntityFramework.EmProjectDbContext, Em.Project.EntityFramework, version=1.0.0.0, Culture=neutral, Publickeytoken=null.

Error Origin: Find multiple dbcontext that satisfy the user's mapping

In my project, EF has multiple levels of inheritance, with the following inheritance structure:

 Public Abstract class Easymandbcontext:abpzerodbcontext<tenant, Role, user>publicclass Emprojectdbcontext: Easymandbcontext

here is a detail: the subclass Easymandbcontext that inherits Abpzerodbcontext should be set to abstract class abstract, on the grounds that the abstraction class will not be instantiated

Found more than one concrete type for given DbContext type (xxx.xxxx.xxx) define Multitenancysideattribute with Tenant