Kaltura_Client_Exception thrown

Invalid KS "NjdiNTg3ZjA5ZjI3NGE1MjYyMThmODhmY2MxOWM0NmI1MDQ0NTJlMnwxMDE7OzE0OTYxMjM3NTI7MjsxNDk2MDM3MzUyLjM4MDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"