Kaltura_Client_Exception thrown

Invalid KS "ZWExMzcxNjE4MWQ2NmU1ZjcwNzQxNThlODdhYzU1ZGE5ZDkzZmMxZXwxMDE7OzE1MDA3MDQ5NDE7MjsxNTAwNjE4NTQxLjE2NTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"