Hey there Pandora Manor,
I understand that you are seeing some issues with your ability to connect to your iPhoto library from iMovie. You may want to treat this as an iPhoto library issue and troubleshoot with that in mind, using the steps in the following article to perform repairs on your iPhoto library:
iPhoto 6 and later: Rebuilding the iPhoto library - Apple Support
https://support.apple.com/en-us/HT201769
Keep in mind that it would be prudent to have a backup of your data on your computer, and especially your iPhoto library, before undertaking these steps. Thanks for coming to the Apple Support Communities!