Kaltura_Client_Exception thrown

Invalid KS "NDg4M2I4M2Q2ODUxYTU1ZDE3M2VjZmM0OGI5OTZmNjcyM2I2YjBjY3wxMDE7OzE0OTA4NzI5Mjc7MjsxNDkwNzg2NTI3LjM5Nzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"