did not find primary SourceFile

i have a problem when making a request using the framework:
here's my code:
`

let file = File(path: "/Users/username/Downloads/file.swift")!
let request  = SourceKittenFramework.Request.cursorInfo(file: "/Users/mostfa/Downloads/file.swift", offset: (90), arguments: [file.path!])
let cursorInfo = try  request.send()

print(cursorInfo)

`

and the response i get is
{"error":true,"reason":"did not find primary SourceFile"}

i tried to google it, but didn't find an answer :(

file path is correct, and the structure for same file is generated as expected,
can anyone help me with this ? thank you very much

Reproduce the reported call through Request.cursorInfo and request.send using the paths, offset, and arguments shown in the issue. Read the SourceKitten request implementation and its error handling to determine why no primary SourceFile is found; done means a confirmed cause and a fix or documented resolution for this request.