Unable to update logs with log-analytics

[Niveshkrishna]

When I try to run /usr/bin/python2 /var/www/matomo/misc/log-analytics/import_logs.py --url=https://example.com --idsite=1 --recorders=4 --enable-http-errors --enable-http-redirects --enable-bots /var/log/containers/nginx/access.ota.log I get the following output :

0 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
Parsing log /var/log/containers/nginx/access.ota.log...
2020-11-11 19:54:44,301: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:44,302: [INFO] Retrying request, attempt number 2
2020-11-11 19:54:44,319: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:44,320: [INFO] Retrying request, attempt number 2
2020-11-11 19:54:44,322: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:44,322: [INFO] Retrying request, attempt number 2
2020-11-11 19:54:44,323: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:44,325: [INFO] Retrying request, attempt number 2
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
2020-11-11 19:54:54,362: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:54,363: [INFO] Retrying request, attempt number 3
2020-11-11 19:54:54,384: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:54,384: [INFO] Retrying request, attempt number 3
2020-11-11 19:54:54,386: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:54,386: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:54:54,387: [INFO] Retrying request, attempt number 3
2020-11-11 19:54:54,387: [INFO] Retrying request, attempt number 3
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
3202 lines parsed, 0 lines recorded, 0 records/sec (avg), 0 records/sec (current)
2020-11-11 19:55:04,412: [INFO] Error when connecting to Matomo: HTTP Error 400: Bad Request
2020-11-11 19:55:04,413: [INFO] Max number of attempts reached, server is unreachable!
Fatal error: Server returned status 400 (Bad Request).
Is the BulkTracking plugin disabled?
You can restart the import of "/var/log/containers/nginx/access.ota.log" from the point it failed by specifying --skip=2 on the command line.

It suddenly stopped working since last one week even though there were no noticeable changes. Any idea what could have gone wrong? BulkTracking in enabled