Version 3 does use a different database setup (the old "stats" database is
gone), but that does not appear to be your problem.
By any chance, did you open up your database using one of the sqlite visual
editing tools? They frequently substitute an empty string ('') for null
values. See your old V2.6.4 User's Guide and look for the troubleshooting
section "Strings in the database." I'd supply a link, but the older User's
Guide are not online. It provides directions on how to get rid of these
empty strings.
-tk
On Mon, Nov 21, 2016 at 2:24 PM, David Watts <[email protected]> wrote:
> Hi
>
> I have weewx v2.6.4 running on an older Raspberry Pi and I'm preparing a
> new Raspberry Pi to use which has weewx v3.6.2.
>
> I tried backing up the weewx database from the old Pi and loading it on to
> the new one, but I got an error (see below) when loading weewx.
>
> Is it because the newer weewx version deals with the database differently?
> If so, is there a way to convert the older database so it works with the
> newer weewx?
>
> Thanks!
>
>
> Nov 21 22:19:42 gosigweather weewx[3377]: engine: Caught unrecoverable
> exception in engine:
> Nov 21 22:19:42 gosigweather weewx[3377]: **** unsupported operand
> type(s) for +=: 'float' and 'unicode'
> Nov 21 22:19:42 gosigweather weewx[3377]: **** Traceback (most recent
> call last):
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/engine.py", line 841, in main
> Nov 21 22:19:42 gosigweather weewx[3377]: **** engine =
> engine_class(config_dict)
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/engine.py", line 76, in __init__
> Nov 21 22:19:42 gosigweather weewx[3377]: ****
> self.loadServices(config_dict)
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/engine.py", line 140, in loadServices
> Nov 21 22:19:42 gosigweather weewx[3377]: ****
> self.service_obj.append(weeutil.weeutil._get_object(svc)(self,
> config_dict))
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/engine.py", line 486, in __init__
> Nov 21 22:19:42 gosigweather weewx[3377]: ****
> self.setup_database(config_dict)
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/engine.py", line 588, in setup_database
> Nov 21 22:19:42 gosigweather weewx[3377]: **** _nrecs, _ndays =
> dbmanager.backfill_day_summary() # @UnusedVariable
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/manager.py", line 1374, in backfill_day_summary
> Nov 21 22:19:42 gosigweather weewx[3377]: ****
> _day_accum.addRecord(_rec)
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/accum.py", line 240, in addRecord
> Nov 21 22:19:42 gosigweather weewx[3377]: **** func(self, record,
> obs_type, add_hilo)
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/accum.py", line 310, in add_value
> Nov 21 22:19:42 gosigweather weewx[3377]: ****
> self[obs_type].addSum(val)
> Nov 21 22:19:42 gosigweather weewx[3377]: **** File
> "/usr/share/weewx/weewx/accum.py", line 87, in addSum
> Nov 21 22:19:42 gosigweather weewx[3377]: **** self.sum += val
> Nov 21 22:19:42 gosigweather weewx[3377]: **** TypeError: unsupported
> operand type(s) for +=: 'float' and 'unicode'
> Nov 21 22:19:42 gosigweather weewx[3377]: **** Exiting.
>
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