Hello Techies,
Recently we have migrated SharePoint 2010 portal from SharePoint 2013. But on few newform.aspx forms we are facing below errors:

Server Error in '/' Application.

Hi Sachin,

Are you using custom master page/default master page on those pages? It seems some tag is misplaced in the master page.

Hi,
we are using custom master page and i checked all the tags and i got the one Sp control in master page with ID:

V4QuickLaunchMenu

Please let me know how i can resolve this