added error message for parameter bug

[JackTemaki]

I had a strange bug, where opening the pickle file would result in the whole config to be loaded again, resulting conflicting emtpy jobs. It took some time until I could find a wrong parameter as cause (it was a wrong class added to a dict which was part of a correct class passed as parameter, the inputs are unfortunately quite complicated sometimes).

[critias]

I'm not sure if I understand the problem correctly. Something similar like this failed in your case:

class Foo(Job):
  ...

class Bar(Job):
  ...

test = Bar({'test': Foo()})
dump = pickle.dumps(test)
test_loaded = pickle.loads(dump)

Correct? The bugfix looks more like treating the symptoms and not the cause, but I need to understand the cause better.

P.S.: Sorry for the late response, I was on vacation.

[JackTemaki]

So the issue was that during pickle.load, the whole Sisyphus config (starting from config/__init__py) was loaded again, which lead to errors. This must have been the case because some dependency was included in the pickle. Unfortunately I corrected everything, so I am not sure if I can produce this error again.

[curufinwe]

Shall we merge @michelwi ? I see no problem adding the code, even if it's not relevant anymore.

[michelwi]

Could we check for a more specific exception or reraise the original exception together with the explanation. Just so if any other error occured the user is not confused.

[JackTemaki]

From my memory I think this was a 'job' as no attribute '_sis_alias_prefixes', and one can explicitly catch for that.