Kaltura_Client_Exception thrown

Invalid KS "ZmE3Y2EwMmEwNzBmYjcwM2NmYTc0Zjc3NWYxMjM2OGQwMGU0MWYyY3wxMDE7OzE0NzUzOTk1MDU7MjsxNDc1MzEzMTA1LjUxNTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"