Kaltura_Client_Exception thrown

Invalid KS "ZGFmZDViMzc5M2ExNDc4NzBiNzY0YzAzZmZkMmUyN2E4YzczODcyY3wxMDE7OzE0OTA2ODQwMjg7MjsxNDkwNTk3NjI4LjgyMjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"