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Hi Rahmat,
I'm afraid you're going to need to be more specific.
a) What are the exact steps that you have taken just before the error occurs?
b) What, specifically, does the error say?
c) Are you using LEAP's "Regions" feature?
d) How have you defined three kinds of electricity?
Please also make sure you're running the most up-to-date version of LEAP, which can be downloaded here:
http://www.energycommunity.org/download
Taylor