Kaltura_Client_Exception thrown

Invalid KS "YmIzNzE5NTlhYjBhNmJjY2NhZjgwNzU5NTFiODM2ODQ1ZTU0MGMyNXwxMDE7OzE0OTU5Mzk2MzM7MjsxNDk1ODUzMjMzLjE2Nzg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"