Unable to cast obj of model to system.collection.generic.IEnumerable

Question

Hi , am getting below exception while casting 

can anyone guide me to fix this ...

 

Unable to cast object of type 'Corel.Common.Models.OneLineItem' to type 'System.Collections.Generic.IEnumerable`1[Corel.Common.Models.OneLineItem]'. 

 

 

created.ForEach(m => OneLineItems.AddRange((IEnumerable<OneLineItem>)m).Cast<OneLineItem>().ToList());