Error While Seeding Using MapProxy

HI,

Below is the error message I am getting while trying to do seeding, my openstreetmap version is 7.0.7.

mapproxy.source.wms - WARNING - could not retrieve WMS map: Error during CGI call (exit code: -9)
Process TileSeedWorker-4:
Traceback (most recent call last):
File “/usr/lib64/python2.7/multiprocessing/process.py”, line 258, in _bootstrap
self.run()
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/seeder.py”, line 139, in run
self.work_loop()
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/seeder.py”, line 154, in work_loop
exceptions=(SourceError, IOError), ignore_exceptions=(LockTimeout, ))
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/util.py”, line 194, in exp_backoff
print(“An error occured. Giving up”, file=sys.strerr)
AttributeError: ‘module’ object has no attribute ‘strerr’
[2020-10-07 20:28:15,347] mapproxy.source.wms - WARNING - could not retrieve WMS map: Error during CGI call (exit code: -9)
Process TileSeedWorker-2:
Traceback (most recent call last):
File “/usr/lib64/python2.7/multiprocessing/process.py”, line 258, in _bootstrap
self.run()
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/seeder.py”, line 139, in run
self.work_loop()
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/seeder.py”, line 154, in work_loop
exceptions=(SourceError, IOError), ignore_exceptions=(LockTimeout, ))
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/util.py”, line 194, in exp_backoff
print(“An error occured. Giving up”, file=sys.strerr)
AttributeError: ‘module’ object has no attribute ‘strerr’
[2020-10-07 20:35:13,844] mapproxy.source.wms - WARNING - could not retrieve WMS map: Error during CGI call (exit code: -9)
Process TileSeedWorker-3:
Traceback (most recent call last):
File “/usr/lib64/python2.7/multiprocessing/process.py”, line 258, in _bootstrap
self.run()
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/seeder.py”, line 139, in run
self.work_loop()
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/seeder.py”, line 154, in work_loop
exceptions=(SourceError, IOError), ignore_exceptions=(LockTimeout, ))
File “/opt/mapproxy/mpenv/lib/python2.7/site-packages/mapproxy/seed/util.py”, line 194, in exp_backoff
print(“An error occured. Giving up”, file=sys.strerr)
AttributeError: ‘module’ object has no attribute ‘strerr’