Kaltura_Client_Exception thrown

Invalid KS "N2JhMDdiZGM2N2U5ZDcxZjUwMGJmODIzNjA3YzgwYjVmYmZiY2NhOXwxMDE7OzE0NjczODk2NDE7MjsxNDY3MzAzMjQxLjM0NjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"