Populate Roles into drop down list hit 'Invalid object name 'dbo.aspnet_SchemaVersions'.

Hi, in my aspx file, I have a drop down list which I hope to populate Roles
<asp:DropDownList class="form-control" id="role" runat="server"></asp:DropDownList> Then at my code behind, I have
role.DataSource = Roles.GetAllRoles() role.DataBind() But then it hits an error ' 'dbo.aspnet_SchemaVersions'.'
I wonder why