Kaltura_Client_Exception thrown

Invalid KS "NGM4MmNhZjg0NTliNzgxOTFiMTVjODAzMGUwODFiM2JiMjJjZjY3Y3wxMDE7OzE0OTM0Mjc4MDQ7MjsxNDkzMzQxNDA0LjczODI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"