Kaltura_Client_Exception thrown

Invalid KS "NzViOTQ5MjVjOGIxYjBhNWI1NGI0NDhlODE5OTFiMThmNjdjNmQ5NnwxMDE7OzE0OTMzMjI3MDA7MjsxNDkzMjM2MzAwLjI1NDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"