Kaltura_Client_Exception thrown

Invalid KS "YTE5ZWY3N2M5MTMwZjcwMzRhN2M5ZjExN2I4MjkzNTlmNTJkZTIyZXwxMDE7OzE0ODgzMjk2MjI7MjsxNDg4MjQzMjIyLjYxNzI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"