Kaltura_Client_Exception thrown

Invalid KS "MDBmZTZjMDNkZTRlNjk5NWE0NGJhMjczNDNhNTYzZTU5NDBkYmRlY3wxMDE7OzE0NzUxNDAwMTc7MjsxNDc1MDUzNjE3LjE1MDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"