yep, that's definitely the case. when scheduler gets a new feature, it's 
possible that the underlying table get changed. as table definitions are 
inside scheduler's code, you need to let migrations happen (or even better, 
drop the scheduler_* tables on the backend, drop related .table files, and 
let them be recreated) to make it work. 

On Monday, February 29, 2016 at 8:56:31 PM UTC+1, Dave S wrote:
>
>
>
> On Monday, February 29, 2016 at 9:06:03 AM UTC-8, peter wrote:
>>
>> I have upgraded to web2py version 2.13.4 from 2.8.2
>>
>> When I use the scheduler I get.
>>
>> OperationalError: table scheduler_task has no column named prevent_drift
>>
>>
>> Any suggestions?
>>
>> Thanks
>>
>> Peter
>>
>>
>
> I think one of Niphlod's standard recommendations may apply:  Turn 
> migrations on (DAL string in models/db.py), access your appadmin page, and 
> then turn migrations off.  (Access can mean browser or wget or curl ... the 
> URL path is the important part (and appadmin is convenient), to insure that 
> models get read).
>
> Your tables might not have changed, but the scheduler was upgraded 18 
> months ago, and that may have involved its tables.
>
> /dps
>
>

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