Trying to create department but getting error

I am trying to create a department using valence API, I am sending the data to route:/d2l/api/lp/1.12/orgstructure/ and the data I am sending is the following:

{"Type":101,

"Name":"Test",

"Code":"TestCode",

"Parents":[{"number":6606}]

}

But I keep getting the following:

"{\"Errors\":[{\"Message\":\"Parents list cannot be empty.\"}]}"