If you try copying nodes within the back office, you may encounter the error. You'll receive an error relating to a method called 'umbraco.dialogs.moveOrCopy.CheckPermissions'. And here is a little tip on how to remove missing or orphaned nodes within Umbraco.

To find any orphaned nodes and remove them, run the following script against your Umbraco database. Make sure you backup your database first. It's a little long winded but the script finds any nodes and dependancies that do not have a version, are not trashed and is of type content. 

delete from cmsPropertyData where contentNodeId in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')
delete from cmsDocument where nodeId in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')
delete from cmsPreviewXml where nodeId in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')
delete from cmsContentVersion where ContentId in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')
delete from cmsContentXml where nodeId in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')
delete from cmsContent where nodeId in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')
delete from umbracoUser2NodePermission where nodeId in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')
delete from umbracoNode where id in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')

You may encounter a situation where some of your orphaned nodes have child nodes. You'll need to remove these as well. To identify and remove child nodes of orphaned children, use the following script before the script above. Make sure you backup your database.

delete from cmsPropertyData where contentNodeId in (select id from UmbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972'))
delete from cmsDocument where nodeId in (select id from UmbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972'))
delete from cmsPreviewXml where nodeId in (select id from UmbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972'))
delete from cmsContentVersion where ContentId in (select id from UmbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972'))
delete from cmsContentXml where nodeId in (select id from UmbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972'))
delete from cmsContent where nodeId in (select id from UmbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972'))
delete from umbracoUser2NodePermission where nodeId in (select id from UmbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972'))
delete from umbracoNode where parentID in (select id from UmbracoNode where id not in (select nodeid from cmsContentXml) and id in (select nodeId from cmsDocument where published = 1) and trashed = 0 and nodeObjectType = 'C66BA18E-EAF3-4CFF-8A22-41B16D66A972')

Hope it works for you!

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