Why does my YouTube videos keep saying error occurred?

When YouTube can’t complete the action you’ve taken, an error message may appear on your device. There are many root causes of error messages, many of which are out of YouTube’s control, including a bad internet connection and insufficient memory on your device.

For More Information Please Refer:
https://support.google.com/youtube/answer/7168344?co=GENIE.Platform%3DAndroid&hl=en
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