Kaltura_Client_Exception thrown

Invalid KS "OTNlZGQwMTQ0YTcwZDU5MWEzMDU5ZGNjYmFkMjA1OTRmZGJiM2NmYnwxMDE7OzE0NzUxNDUwNDQ7MjsxNDc1MDU4NjQ0Ljk4OTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"