Kaltura_Client_Exception thrown

Invalid KS "N2RmN2JjMjkzNGI2M2JjZWYzOWIyNTNkNWNjNTM2NWNiYjRmYzFiM3wxMDE7OzE0NzUxMjE0OTI7MjsxNDc1MDM1MDkyLjYyMTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"