Kaltura_Client_Exception thrown

Invalid KS "N2EyZjFjY2NiODg5YzdmNTI4YWNiOWEzZmU0YTJkNmU2ODY1OTQ4YXwxMDE7OzE0ODQ4MjgxMzc7MjsxNDg0NzQxNzM3Ljc4MDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"