Kaltura_Client_Exception thrown

Invalid KS "OTFlZDZiMTYzZmQ4NWE0OTQwZGYwMjdlN2ViNzBmMjM2M2ZjNTg5MHwxMDE7OzE0OTU3MzUyNzY7MjsxNDk1NjQ4ODc2LjA5NTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"