Kaltura_Client_Exception thrown

Invalid KS "NzE4MmZkNDM4YjQxYzNiNTAxZjJkOTEwMTE3ZjBlMjdlN2RhMjhhOXwxMDE7OzE0NzU0MzY2MDk7MjsxNDc1MzUwMjA5Ljc3OTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"