"An error occurred during upload" iMovie for iOS

HI, I was wondering if anyone could help? I was trying to make a movie for my Father's 67th birthday. I created the movie with a mixture of videos and photos from my phone, with some text on some and some music to accompany it. When I try to "save to camera roll" it comes up with the message, "An error occurred during export". I have no idea why this is happening. I have tried all the other options - YouTube, Facebook, iMovie theatre, and they all don't work. With those options the say that the movie is uploading but it doesn't actually do anything. Fortunately I was able to show him through AirPlay and previewing the movie but I want it on my camera roll so that he can have a copy and my family can. Anybody got any suggestions? This is an example of what it shows me!