read data from mikrotik ??

hello all iam beginner to API script i use it with c# i want to read ppp secret user to c# but i cant do that cause i dont have the right script can any one help me plz
i can add user but cant read or delete

use

/ppp/secret/print

what is the problem?

use this command:

/ppp/secret/print

what is the problem?