List of possible errors of the Face Recognition Server

{
 "FAILED_TO_ADD_PERSON": "Failed to add person. Check request parameters or database",
 "FACE_NOT_FOUND": "Face not found on supplied image",
 "MAXIMUM_FIRS": "Maximum FIR in database",
 "SERVER_NOT_READY": "Server is initializing, please wait",
 "FAILED_TO_DELETE_PERSON": "Failed to delete person. Check request parameters or database",
 "FAILED_TO_ADD_PERSON_MANY_FACES": "The image shown has more than one face",
 "FAILED_TO_SAVE_DATABASE": "Failed to save person. Check request parameters or database",
 "FAILED_TO_UPDATE_PERSON": "Failed to update person. Check request parameters or database"
}