<connectionStrings>
<add name="projeEntities" connectionString="metadata=res://*/Models.EntityFrameworks.ProjeModel.csdl|res://*/Models.EntityFrameworks.ProjeModel.ssdl|res://*/Models.EntityFrameworks.ProjeModel.msl;provider=Npgsql;provider connection string="Host=127.0.0.1;Database=proje;Username=postgres;Password=sdt2018;"" providerName="System.Data.EntityClient" />
</connectionStrings>
I did this and version check,then it works