Cannot link address to a customer usig REST API's

I am trying to create customer and I need to add address to him and I have to link him by creating Address and mention my customer using links Filed.

Using REST API’s Adding address without links field occurs successfully as shown below

But when I added links filed I got the following exception

I got it, the problem related to the filed name in links array “link_doctype” , I wrote it with upper case “T” rather than lower case “t”