Photos not able to copy iPhoto files
I recently bought an iMac 21 inch and can't seem to add my iPhoto library from my old iMac to it. I've tried dropping the iPhoto library onto the Photos icon in the dock and get the error message -
"These items cannot be added to you Photo library because the file format is not supported by Photos"
I really want to get my iPhoto library copied across because my old iMac is about to die! I do have a TIME MACHINE back up of the entire old Mac's hard drive.
Any help is much appreciated.
iMac Line (2012 and Later)