Kaltura_Client_Exception thrown

Invalid KS "NWE0NTkxOTk0MTVjMmE2MGE5MTFkNTc1Y2QzNDUyMmY4OWYzZDBiOXwxMDE7OzE0OTMyMzE4MjY7MjsxNDkzMTQ1NDI2LjIwMTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"