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Unable to enable scheduler

Hello everyone.

I’ve setup ERPNext via the easy install method (had a few issues then followed Joseph_Marie_Alba response to my post here: Easy Install is definitely bugged on Ubuntu 18.04 )

After setting up and switching to production, I noticed I received a message that scheduler is not enabled.

I attempted bench enable-scheduler, but received the error below.

Traceback (most recent call last):

File “/usr/lib/python3.6/runpy.py”, line 193, in _run_module_as_main
main”, mod_spec)
File “/usr/lib/python3.6/runpy.py”, line 85, in _run_code
exec(code, run_globals)
File “/home/erpnext/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 97, in
main()
File “/home/erpnext/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 18, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 764, in call
return self.main(*args, **kwargs)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 717, in main
rv = self.invoke(ctx)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 555, in invoke
return callback(*args, **kwargs)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/erpnext/frappe-bench/apps/frappe/frappe/commands/init.py”, line 25, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/erpnext/frappe-bench/apps/frappe/frappe/commands/scheduler.py”, line 39, in enable_scheduler
for site in context.sites:
TypeError: ‘NoneType’ object is not iterable

Bit of google, I looked into Error on install ERPNext to new bench instance and their solution was to update bench. I updated bench with no issues, but still same error.

I looked into Bench Update TypeError: 'NoneType' object is not iterable (during Updating DocTypes for frappe) (though their problem is not similar to mine, they recommended clearing cache before updating).

bench clear-cache resulted in the error below.

Traceback (most recent call last):

File “/usr/lib/python3.6/runpy.py”, line 193, in _run_module_as_main
main”, mod_spec)
File “/usr/lib/python3.6/runpy.py”, line 85, in _run_code
exec(code, run_globals)
File “/home/erpnext/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 97, in
main()
File “/home/erpnext/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 18, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 764, in call
return self.main(*args, **kwargs)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 717, in main
rv = self.invoke(ctx)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/core.py”, line 555, in invoke
return callback(*args, **kwargs)
File “/home/erpnext/frappe-bench/env/lib/python3.6/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/erpnext/frappe-bench/apps/frappe/frappe/commands/init.py”, line 25, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/erpnext/frappe-bench/apps/frappe/frappe/commands/utils.py”, line 45, in clear_cache
for site in context.sites:
TypeError: ‘NoneType’ object is not iterable

So at this point I have two “TypeError: ‘NoneType’ object is not iterable” errors for two different commands, and not sure whats the root cause. Note that at the moment my erpnext instance is up and running with no issues.

Quick update,

I was reading around and discovered the “bench doctor” command, which results in the following:
-----Checking scheduler status-----
Workers online: 3
-----erp.virtuetm.com Jobs-----

Does this mean scheduler is online? If so, why do I receive the errors above?

This is a weird scenario.