The missing ' wasn't the problem, i forgot to add it in the post.
I tried to remove the comments at the end of server and path, but still no success
Apr 15 21:01:13 raspberrypi systemd[1]: Starting LSB: weewx weather system...
Apr 15 21:01:13 raspberrypi weewx[15101] INFO __main__: Initializing weewx version 4.5.1
Apr 15 21:01:13 raspberrypi weewx[15101] INFO __main__: Using Python 3.5.3 (default, Jan 19 2017, 14:11:04) #012[GCC 6.3.0 20170124]
Apr 15 21:01:13 raspberrypi weewx[15101] INFO __main__: Platform Linux-4.9.41-v7+-armv7l-with-debian-9.1
Apr 15 21:01:13 raspberrypi weewx[15101] INFO __main__: Locale is 'de_DE.UTF-8'
Apr 15 21:01:13 raspberrypi weewx[15101] INFO __main__: PID file is /var/run/weewx.pid
Apr 15 21:01:13 raspberrypi weewx[15105] INFO __main__: Using configuration file /home/weewx/weewx.conf
Apr 15 21:01:13 raspberrypi weewx[15105] INFO __main__: Debug is 0
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.engine: Loading station type FineOffsetUSB (weewx.drivers.fousb)
Apr 15 21:01:14 raspberrypi weewx[15090]: Starting weewx weather system: weewx.
Apr 15 21:01:14 raspberrypi systemd[1]: Started LSB: weewx weather system.
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.drivers.fousb: driver version is 1.20
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.drivers.fousb: polling mode is PERIODIC
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.drivers.fousb: polling interval is 60
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.drivers.fousb: found station on USB bus= device=
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.engine: StdConvert target unit is 0x1
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.engine: Archive will use data binding wx_binding
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.engine: Record generation will be attempted in 'software'
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.engine: Using archive interval of 300 seconds (software record generation)
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.restx: StationRegistry: Station will be registered.
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.restx: Wunderground: Posting not enabled.
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.restx: PWSweather: Posting not enabled.
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.restx: CWOP: Posting not enabled.
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.restx: WOW: Posting not enabled.
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.restx: AWEKAS: Posting not enabled.
Apr 15 21:01:14 raspberrypi weewx[15105] INFO __main__: Starting up weewx version 4.5.1
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.engine: Using binding 'wx_binding' to database 'weewx.sdb'
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.manager: Starting backfill of daily summaries
Apr 15 21:01:14 raspberrypi weewx[15105] INFO weewx.manager: Daily summaries up to date
Apr 15 21:01:15 raspberrypi weewx[15105] ERROR weewx.drivers.fousb: unrecognised magic number 0923
Apr 15 21:01:15 raspberrypi weewx[15105] INFO weewx.drivers.fousb: synchronising to the weather station (quality=1)
Apr 15 21:01:59 raspberrypi weewx[15105] INFO weewx.drivers.fousb: unstable read: blocks differ for ptr 0x000000
Apr 15 21:02:00 raspberrypi weewx[15105] INFO weewx.manager: Added record 2021-04-15 23:01:59 CEST (1618520519) to database 'weewx.sdb'
Apr 15 21:02:00 raspberrypi weewx[15105] INFO weewx.manager: Added record 2021-04-15 23:01:59 CEST (1618520519) to daily summary in 'weewx.sdb'
Apr 15 21:02:00 raspberrypi weewx[15105] INFO weewx.engine: Starting main packet loop.
Apr 15 21:02:01 raspberrypi weewx[15105] INFO weewx.restx: StationRegistry: Published record 2021-04-15 23:01:59 CEST (1618520519)
Apr 15 21:02:03 raspberrypi weewx[15105] INFO weewx.drivers.fousb: station status {'rain_overflow': 0, 'unknown': 0, 'lost_connection': 0} (0)
Apr 15 21:06:04 raspberrypi weewx[15105] INFO weewx.manager: Added record 2021-04-15 23:05:00 CEST (1618520700) to database 'weewx.sdb'
Apr 15 21:06:04 raspberrypi weewx[15105] INFO weewx.manager: Added record 2021-04-15 23:05:00 CEST (1618520700) to daily summary in 'weewx.sdb'
Apr 15 21:06:10 raspberrypi weewx[15105] INFO weewx.cheetahgenerator: Generated 8 files for report SeasonsReport in 5.76 seconds
Apr 15 21:06:16 raspberrypi weewx[15105] INFO weewx.imagegenerator: Generated 30 images for report SeasonsReport in 6.10 seconds
Apr 15 21:06:16 raspberrypi weewx[15105] INFO weewx.reportengine: Copied 5 files to /home/weewx/public_html
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: ftpgenerator: (0): caught exception '<class 'socket.gaierror'>': [Errno -2] Der Name oder der Dienst ist nicht bekannt
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** Traceback (most recent call last):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/home/weewx/bin/weewx/reportengine.py", line 331, in run
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** n = ftp_data.run()
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/home/weewx/bin/weeutil/ftpupload.py", line 133, in run
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** ftp_server.connect(self.server, self.port)
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/ftplib.py", line 153, in connect
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** source_address=self.source_address)
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/socket.py", line 694, in create_connection
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** for res in getaddrinfo(host, port, 0, SOCK_STREAM):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/socket.py", line 733, in getaddrinfo
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** socket.gaierror: [Errno -2] Der Name oder der Dienst ist nicht bekannt
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: ftpgenerator: (1): caught exception '<class 'socket.gaierror'>': [Errno -2] Der Name oder der Dienst ist nicht bekannt
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** Traceback (most recent call last):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/home/weewx/bin/weewx/reportengine.py", line 331, in run
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** n = ftp_data.run()
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/home/weewx/bin/weeutil/ftpupload.py", line 133, in run
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** ftp_server.connect(self.server, self.port)
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/ftplib.py", line 153, in connect
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** source_address=self.source_address)
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/socket.py", line 694, in create_connection
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** for res in getaddrinfo(host, port, 0, SOCK_STREAM):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/socket.py", line 733, in getaddrinfo
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** socket.gaierror: [Errno -2] Der Name oder der Dienst ist nicht bekannt
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: ftpgenerator: (2): caught exception '<class 'socket.gaierror'>': [Errno -2] Der Name oder der Dienst ist nicht bekannt
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** Traceback (most recent call last):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/home/weewx/bin/weewx/reportengine.py", line 331, in run
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** n = ftp_data.run()
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/home/weewx/bin/weeutil/ftpupload.py", line 133, in run
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** ftp_server.connect(self.server, self.port)
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/ftplib.py", line 153, in connect
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** source_address=self.source_address)
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/socket.py", line 694, in create_connection
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** for res in getaddrinfo(host, port, 0, SOCK_STREAM):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** File "/usr/lib/python3.5/socket.py", line 733, in getaddrinfo
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: **** socket.gaierror: [Errno -2] Der Name oder der Dienst ist nicht bekannt
Apr 15 21:06:17 raspberrypi weewx[15105] ERROR weewx.reportengine: ftpgenerator: Upload failed