Kaltura_Client_Exception thrown

Invalid KS "ZTg3YTE4ZWQ1ZTIwNjg0MzkxN2ZmYmNmZWViN2ZkZDM3ODQ4Y2ZlNnwxMDE7OzE0OTYxMjM0NTI7MjsxNDk2MDM3MDUyLjAyMDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"