Q: How to fix pictures marked as "missing plugin" imported from iphoto to imovie?

Hi!

I´m editing a video in imovie 10.1.1 with pictures imported from photo 9.6.1. and some of them apear as "Missing Pulgin". When i replace them they seam to be ok for 10 seconds and then it goes back to "? Missing Pulgin"

I´m currently using Yosemity10.10.5

Thanks in advance for the help!