After copying a course that contained LTI content I am receiving this message.  "Import Error: Assignment - "Respond: Analyze the Text [Ode to enchanted light]" Import Error: Assignment - "Respond: Analyze the Text [The Drought]" Import Error: Assignment - "Respond: Choices [Never Retreat from Eyes Wide Open]" Import Error: Assignment - "Respond: Choices [Ode to enchanted light]" 

What would be causing this?