Hi @Kathy Smith ,
If you are running Confluence Server, please notice a Security Advisory was released this year Confluence Security Advisory - 2019-03-20 and it is important that you upgrade Confluence to a version where this issue is no longer a threat. You can review all Security Advisory released on Confluence Security Overview and Advisories.
Since we do not have much information about the error you are experiencing and in which application, here is a bug from Atlassian issue tracker:
So we can help provide you with a better assistance, could you please inform if you are running Confluence Server or Confluence Cloud. If Confluence Server, what is the version you are running? Last but not least, what is the YouTube video url you are using?
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