Error when launching game to phone

as title says i get a error when i launch game to phone im using a plugin for admob found on github the error is

ERROR: AndroidManifest.xml is invalid System.Xml.XmlException: Name cannot begin with the ‘@’ character, hexadecimal value 0x40. Line 5, position 51.
LogPlayLevel: at System.Xml.XmlTextReaderImpl.Throw(Exception e)

if anyone knows problem let me know!