Eror 1110: The specified request headers are not valid: element 1 is not a list

Eror 1110: The specified request headers are not valid: element 1 is not a list
I am getting this error please help me i can’t solve it in any way please

PLEASE HELP ME

You will have to use a list of key/value pairs

See for a correct request header this example App Inventor Tutorials and Examples: Dropbox | Pura Vida Apps

Taifun