Inconsistent accessibility CS053

Question

I am getting CS053 Inconsistent accessibility on some of these.

I can get the first 2 of them to work. LMDP & DP are fine, the remainder have the error associated with them.

Here's the error

Severity Code Description Project File Line Suppression State Error CS0053 Inconsistent accessibility: property type List<MDBModel> is less accessible than property PowerDistributionModel.MDB MasterCalcLibrar

namespace MasterCalcLibrary
{
    public class PowerDistributionModel
    {
     public List<LMDPModel> LMDP { get; set; } = new List<LMDPModel>();
     public List<LMDPModel> DP { get; set; } = new List<LMDPModel>();
     public List<MDBModel> MDB { get; set; } = new List<MDBModel>();
     public List<MCPModel> MCP { get; set; } = new List<MCPModel>();
     public List<Manifestmodel> Manifest { get; set; } = new List<Manifestmodel>();
     public List<VFDModel> VFD { get; set; } = new List<VFDModel>();
     public List<TRCPModel> TRCP { get; set; } = new List<TRCPModel>();
     public List<URCPModel> URCP { get; set; } = new List<URCPModel>();
     public List<SRCPModel> SRCP { get; set; } = new List<SRCPModel>();
    }
}