Kaltura_Client_Exception thrown

Invalid KS "M2QyZjJkYzU5YzE5MWYxMjEzNDVhMjYzMmJlOTFiMTllZTAxYjZhYXwxMDE7OzE0OTM1MzY2MzY7MjsxNDkzNDUwMjM2Ljk2NDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"