Can you provide the console output showing the error and/or the log output.
Gary
May 1 19:18:35 raspberrypi wee_import[14521] INFO __main__: Starting wee_import...
May 1 19:18:35 raspberrypi wee_import[14521] DEBUG weewx.manager: Daily summary version is 2.0
May 1 19:18:35 raspberrypi wee_import[14521] INFO weeimport.wuimport: Observation history for Weather Underground station 'KILSULLI1' wi$
May 1 19:18:35 raspberrypi wee_import[14521] DEBUG weeimport.wuimport: The following options will be used:
May 1 19:18:35 raspberrypi wee_import[14521] DEBUG weeimport.wuimport: config=/etc/weewx/weewx.conf, import-config=/etc/weewx/wu-im$May 1 19:18:35 raspberrypi wee_import[14521] DEBUG weeimport.wuimport: station=KILSULLI1, from=2008-01-01, to=2009-01-01
May 1 19:18:35 raspberrypi wee_import[14521] DEBUG weeimport.wuimport: apiKey=****************************0bdd
May 1 19:18:35 raspberrypi wee_import[14521] DEBUG weeimport.wuimport: dry-run=None, calc_missing=True, ignore_invalid_data=True
May 1 19:18:35 raspberrypi wee_import[14521] DEBUG weeimport.wuimport: tranche=1000, interval=derive, wind_direction=[0.0, 360.0]
Good that it is working. I have spent some time today trying to find something on usage limits for the new WU API but without success. The old API was generous enough that I could not see wee_import (by itself) exceeding any limits. I have no idea about the new API, but these days nothing surprises me when it comes to WU. Take it while you can.
Gary