Dialog error?

I am about half way through editing a project and this morning I moved all of the files onto an external hard drive and deleted them from the internal drive of the computer.  They were imported to premiere from the internal and now that I deleted them from the internal I am receiving a popup on premiere that says 'Dialog error! Unable to load dialog resource'. I already emptied them from the trash, but all the files are located on the external so should I move them back into the internal for the time being or is there an easier way to go about it?