Kaltura_Client_Exception thrown

Invalid KS "NWI1MmMyZDA4MjQ1MGVhNTUxNDMyMjJmNjQxZmQ5N2NlZjE4ZjY0N3wxMDE7OzE0OTMyMzkzNzY7MjsxNDkzMTUyOTc2LjE0NDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"