If you're running windows 10 and get this error in EasyWorship,
Microsoft released an update (KB3150513) that broke the video codecs in windows and crashed multiple programs that do any kind of video playback, including EW. They have since released a new update (KB4015438) that fixes their bug and needs to be installed. You can go to your Windows Updates (Click the windows logo button on the bottom left of your screen and type in Update and click Check for Updates) and install this update to fix the issue. If you don't see the update available, you can click on Check for Updates button. You can also click on Update History to see if the new update is already installed.
If you still have problems playing videos after installing the update, you may also need to uninstall and reinstall Quicktime.
Here is a link to a Quicktime download if you need to reinstall it.https://www.easyworship.com/downloads/Utilities/VideoTools/QuickTimeInstaller.exe