dogus.py not work

root@dm920:~# /usr/sbin/streamlinksrv manualstart debug
[streamlinksrv][info] Fri Aug 13 15:21:58 2021 Server (1.8.2) started
[streamlinksrv][debug] Host: dm920
[streamlinksrv][debug] Port: 8088
[streamlinksrv][debug] OS: Linux-3.14-1.17-dm920-armv7l-with-glibc2.4
[streamlinksrv][debug] Python: 2.7.18
[streamlinksrv][info] Streamlink: 1.27.3.0 / 2021-04-19
[streamlinksrv][debug] youtube-dl: 2021.06.06
[streamlinksrv][debug] Requests(2.22.0), Socks(1.7.1), Websocket(0.59.0)
[streamlinksrv][debug] Arguments:

[streamlinksrv][info] Found matching plugin dogus for URL http://www.startv.com.tr/canli-yayin
[streamlinksrv][error] No playable streams found on this URL: http://www.startv.com.tr/canli-yayin
[streamlinksrv][debug] Send Offline clip
[streamlinksrv][debug] Arguments:
[streamlinksrv][debug] url=http://www.startv.com.tr/canli-yayin
[streamlinksrv][debug] stream=['best']
[streamlinksrv][info] Found matching plugin dogus for URL http://www.startv.com.tr/canli-yayin
[streamlinksrv][error] No playable streams found on this URL: http://www.startv.com.tr/canli-yayin
[streamlinksrv][debug] Send Offline clip

Don't comment on old and merged PRs. Open a new plugin issue and provide all the required details using the latest Streamlink version, and not some 3rd party tool which is using a fork of Streamlink.
https://github.com/streamlink/streamlink/issues/new/choose