Key error is raised when trying to generate the rules from the itemsets

Hi,
thanks a lot for the amazing repository.

I'm using this to generate association rules. Extracting the itemsets of different lengths is not a problem. Also, extracting the itemsets and directly using it to generate rules works. However, after saving the itemsets to a file, generating the rules after reading the saved file generates this error:

KeyError: 'frozenset({'1', 'z', 'f', 'a', "'", ')', 'l', '(', 'o', 'k', 'r', ' ', 'b', '%', 'e', 's', 'm', '}', '{', 'i', 'u', 't'})You are likely getting this error because the DataFrame is missing antecedent and/or consequent information. You can try using the support_only=True option'

I understand that it's because the code can't find the support of one of the antecedents/consequent items but have no idea how to solve it? I've read all the possible solutions in this thread: https://github.com/rasbt/mlxtend/issues/390 but none of them works. Also tried to save the itemsets to a csv file separated by ; rather than , to avoid special characters problem but still have the problem.

I'm using: python 3.7
mlxtend version: 0.17.2

Would appreciate any idea,
Thanks.
Bushra.

Reproduce the failure with the reported Python 3.7 and mlxtend 0.17.2 workflow, comparing in-memory itemsets with the saved-and-reloaded data passed to association-rule generation. Trace the itemset save/read path and rule-generation entry point; done means reloaded itemsets generate rules without the reported KeyError and the behavior is covered by a regression test.