Kaltura_Client_Exception thrown

Invalid KS "ZGJhMjkxODg2OTA4OGNlZjMxYzdhZGUxOTZiODc2NGQ2ZjNkNGQ5OHwxMDE7OzE0NzUxNjM5NDA7MjsxNDc1MDc3NTQwLjMxODg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"