Kaltura_Client_Exception thrown

Invalid KS "Mjc3ZWM2NWNmMjNjNjI5YjdjYzc4MjhjNDg4Y2MzYzRjYjg0OTNlNnwxMDE7OzE0OTM2MDI1ODc7MjsxNDkzNTE2MTg3Ljk2NDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"