Cant do keycheck on source

when i use chrome and get DOM
into variable gwnm
and then try to do keycheck on variable input.gunm or data.gunm
it gives me this error

[Executing block Keycheck] RuntimeBinderException: 'System.Dynamic.ExpandoObject' does not contain a definition for 'gwnm'

you don’t need to specify input.gunm you can directly put the variable like that image