Kaltura_Client_Exception thrown

Invalid KS "YjA5MmI2YjczYmI0NDdkMGVkMmI5OWFmNjUwZDk0NGEzZjFlMjQwNXwxMDE7OzE0NzUwNzkyNzA7MjsxNDc0OTkyODcwLjQ5Nzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"