Kaltura_Client_Exception thrown

Invalid KS "OTM2NjQ2NGFiMjI5ZGQyY2M5YmEwOTdkNjhmNGUzMTNlNTJjYmRhZHwxMDE7OzE0NzU0NDkwMjI7MjsxNDc1MzYyNjIyLjQwMDQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"