Device not polling (ubuntu 16.04)

My librenms on Ubuntu 16.04 was stopped working after getting php version updated to 8 and now I have downgraded to 7.4. But now all graphs are showing empty :
While running the command its giving following error:
./ 16
Traceback (most recent call last):
File “./”, line 28, in
import LibreNMS.library as LNMS
File “/opt/librenms/LibreNMS/”, line 12, in
from .service import Service, ServiceConfig
File “/opt/librenms/LibreNMS/”, line 6, in
import pymysql
File “/opt/librenms/.local/lib/python3.5/site-packages/pymysql/”, line 59, in
from . import connections # noqa: E402
File “/opt/librenms/.local/lib/python3.5/site-packages/pymysql/”, line 206
SyntaxError: invalid syntax

Please somebody help me.


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