Kaltura_Client_Exception thrown

Invalid KS "YzgwNzI3OWNkYjA5YTU0MjhmNDY3NWYzMzRmZDc4YTg2MjE4OTE3ZnwxMDE7OzE0OTA0MjI1Mzg7MjsxNDkwMzM2MTM4Ljk5ODY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"