I’ve managed to fix the LOCALE error but the problem with the internal error is still there.
Mar 17 09:12:25 asterix weewx[25044]: engine: Initializing weewx version 3.0.1
Mar 17 09:12:25 asterix weewx[25044]: engine: Using Python 2.7.6 (default, Mar 22 2014, 22:59:56) #012[GCC 4.8.2]
Mar 17 09:12:25 asterix weewx[25044]: engine: pid file is /var/run/weewx.pid
Mar 17 09:12:25 asterix weewx[25046]: engine: Using configuration file /etc/weewx/weewx.conf
Mar 17 09:12:25 asterix weewx[25046]: engine: Initializing engine
Mar 17 09:12:25 asterix weewx[25046]: engine: Loading station type Vantage (weewx.drivers.vantage)
Mar 17 09:12:25 asterix weewx[25046]: vantage: Opened up serial port /dev/ttyUSB1, baudrate 19200
Mar 17 09:12:26 asterix weewx[25046]: vantage: successfully woke up console
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.engine.StdTimeSynch
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.engine.StdTimeSynch
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.engine.StdConvert
Mar 17 09:12:26 asterix weewx[25046]: engine: StdConvert target unit is 0x1
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.engine.StdConvert
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.engine.StdCalibrate
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.engine.StdCalibrate
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.engine.StdQC
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.engine.StdQC
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.wxservices.StdWXCalculate
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.wxservices.StdWXCalculate
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.engine.StdArchive
Mar 17 09:12:26 asterix weewx[25046]: engine: Archive will use data binding wx_binding
Mar 17 09:12:26 asterix weewx[25046]: engine: Record generation will be attempted in 'hardware'
Mar 17 09:12:26 asterix weewx[25046]: engine: Using archive interval of 60 seconds
Mar 17 09:12:26 asterix weewx[25046]: engine: Use LOOP data in hi/low calculations: 1
Mar 17 09:12:26 asterix weewx[25046]: engine: Using binding 'wx_binding' to database 'weewx'
Mar 17 09:12:26 asterix weewx[25046]: engine: Starting backfill of daily summaries
Mar 17 09:12:26 asterix weewx[25046]: engine: Daily summaries up to date.
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.engine.StdArchive
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.restx.StdStationRegistry
Mar 17 09:12:26 asterix weewx[25046]: restx: StationRegistry: Station will be registered.
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.restx.StdStationRegistry
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.restx.StdWunderground
Mar 17 09:12:26 asterix weewx[25046]: restx: Wunderground-PWS: Data for station IZUIDHOL198 will be posted
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.restx.StdWunderground
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.restx.StdPWSweather
Mar 17 09:12:26 asterix weewx[25046]: restx: PWSWeather: Data will not be posted: Missing option 'station'
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.restx.StdPWSweather
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.restx.StdCWOP
Mar 17 09:12:26 asterix weewx[25046]: restx: CWOP: Data for station PD3EM will be posted
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.restx.StdCWOP
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.restx.StdWOW
Mar 17 09:12:26 asterix weewx[25046]: restx: WOW: Data will not be posted: Missing option 'station'
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.restx.StdWOW
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.restx.StdAWEKAS
Mar 17 09:12:26 asterix weewx[25046]: restx: AWEKAS: Data will not be posted: Missing option 'username'
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.restx.StdAWEKAS
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.engine.StdPrint
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.engine.StdPrint
Mar 17 09:12:26 asterix weewx[25046]: engine: Loading service weewx.engine.StdReport
Mar 17 09:12:26 asterix weewx[25046]: engine: Finished loading service weewx.engine.StdReport
Mar 17 09:12:26 asterix weewx[25046]: engine: Starting up weewx version 3.0.1
Mar 17 09:12:26 asterix weewx[25046]: vantage: successfully woke up console
Mar 17 09:12:26 asterix weewx[25046]: engine: Clock error is 3.10 seconds (positive is fast)
Mar 17 09:12:26 asterix weewx[25046]: vantage: Getting archive packets since 2015-03-16 21:25:00 CET (1426537500)
Mar 17 09:12:27 asterix weewx[25046]: vantage: successfully woke up console
Mar 17 09:12:27 asterix weewx[25046]: vantage: Retrieving 142 page(s); starting index= 2
Mar 17 09:12:28 asterix weewx[25046]: engine: Internal error detected. Catchup abandoned
Mar 17 09:12:28 asterix weewx[25046]: **** Unknown archive type = 0xc0
Mar 17 09:12:28 asterix weewx[25046]: engine: Starting main packet loop.
Mar 17 09:12:28 asterix weewx[25046]: vantage: successfully woke up console
Mar 17 09:12:28 asterix weewx[25046]: vantage: Requesting 200 LOOP packets.
Mar 17 09:12:29 asterix weewx[25046]: vantage: successfully woke up console
So still the internal error on the engine and an unknown archive type.