We are getting following errors continuously on magento 2.2.1 after upgrade to 2.1.9 in var/log/system.log file.

Can anybuddy facing same ?

[2018-01-22 10:04:12] main.INFO: Broken reference: the 'catalog.compare.sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2018-01-22 10:04:12] main.INFO: Broken reference: the 'sale.reorder.sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2018-01-22 10:04:12] main.INFO: Broken reference: the 'wishlist_sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2018-01-22 10:04:12] main.INFO: Broken reference: the 'shopbybrand.block.sidebar' element cannot be added as child to 'sidebar.main', because the latter doesn't exist [] [] [2018-01-22 10:04:12] main.INFO: Broken reference: the 'wp.sidebar' element cannot be added as child to 'sidebar.main', because the latter doesn't exist [] [] [2018-01-22 10:04:12] main.INFO: Broken reference: the 'shopbybrand.block.sidebar' tries to reorder itself towards '', but their parents are different: 'sidebar.main' and '' respectively. [] [] [2018-01-22 10:04:12] main.INFO: Broken reference: the 'wp.sidebar' tries to reorder itself towards '', but their parents are different: 'sidebar.main' and '' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'catalog.compare.sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'sale.reorder.sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'wishlist_sidebar' element cannot be added as child to 'sidebar.additional', because the latter doesn't exist [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'shopbybrand.block.sidebar' element cannot be added as child to 'sidebar.main', because the latter doesn't exist [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'product.info.feed.sec' element cannot be added as child to 'content.top.most', because the latter doesn't exist [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'shopbybrand.block.sidebar' tries to reorder itself towards '', but their parents are different: 'sidebar.main' and '' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'product.info.price' tries to reorder itself towards 'product.info.review', but their parents are different: 'product.info.main' and 'product.info.price' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'product.price.final' tries to reorder itself towards 'product.info.sku', but their parents are different: 'product.info.price' and 'product.info.stock.sku' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'product.info.social' tries to reorder itself towards 'product.info.overview', but their parents are different: 'product.info.extrahint' and 'product.info.main' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'skip_gallery_before' tries to reorder itself towards 'product.info.media.image', but their parents are different: 'skip_gallery_before.wrapper' and 'product.info.media' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'skip_gallery_after' tries to reorder itself towards 'product.info.media.image', but their parents are different: 'skip_gallery_after.wrapper' and 'product.info.media' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'product.info.details' tries to reorder itself towards 'product.info.media', but their parents are different: 'content' and 'product.main.section' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'product.info.feed.sec' tries to reorder itself towards 'product.info.main', but their parents are different: 'content.top.most' and 'product.main.section' respectively. [] [] [2018-01-22 10:04:15] main.INFO: Broken reference: the 'product.info.description.accordian' tries to reorder itself towards 'product.info.extrahint', but their parents are different: 'content' and 'product.info.main' respectively. [] []