Kaltura_Client_Exception thrown

Invalid KS "NzMzODdjNGYwNzI4ZjdlYmQ1ZDRhMzUyMDMzN2U2MTA5NmZmYTNhZnwxMDE7OzE0OTM0NTM4MjQ7MjsxNDkzMzY3NDI0LjU0ODY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"