that error comes only on two codepaths: tables that are missing columns 
(and/or have different column types) and database locks.
try dropping tables, letting scheduler recreate them and see what happens.

On Monday, May 30, 2016 at 1:53:04 PM UTC+2, Scott Hunter wrote:
>
> I have an appliance hosted on pythonanywhere which uses the Scheduler 
> (invoked using a separate web2py process with the -K switch).
>
> This setup in my test environment (OS X at home) works fine, but on 
> pythonanywhere, the scheduler process generates a stream of errors like:
>
> ERROR:web2py.scheduler.giles-livetask2#30970:Error coordinating TICKER
> ERROR:web2py.scheduler.giles-livetask2#30970:    error popping tasks
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:    error popping tasks
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:    error popping tasks
> ERROR:web2py.scheduler.giles-livetask2#30970:Error coordinating TICKER
> ERROR:web2py.scheduler.giles-livetask2#30970:    error popping tasks
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:    error popping tasks
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
> ERROR:web2py.scheduler.giles-livetask2#30970:    error popping tasks
> ERROR:web2py.scheduler.giles-livetask2#30970:Error retrieving status
>
>
> Attempts to schedule a task fail to even have a new task record inserted, 
> much less executing that task.
>
> It was working a week ago.  I thought it might be due to upgrading to 
> 2.14.6, but the last successful tasks show 
> "web2py.scheduler.giles-livetask", so maybe the problem came after that 
> upgrade.
>
> I thought maybe the scheduler database was corrupted, but I can view the 
> records via the admin appliance.
>
> Any suggestions as to what I should investigate next would be appreciated.
>
> - Scott
>

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