how's it work and could i use it in sprangular as a frontend ?

[FadliKun]

i'm using spree_multi_currency 2-4-stable,
and using sprangular for frontend...

I think the error isn't in the code, it's maybe because I do not understand how to configure it.

initially run well if I just fills supported currencies with a single currency, and I can fill the nominal money in the prices page,
but I get an error message when trying to fill currencies supported by "EUR, USD, IDR" ...

this is the error message "undefined method `iso_code' for nil:NilClass",

1. can i fiils the supported currencies with a multiple currency ? how to configure it ?
2. I think the frontend course provides a dropdown to change the currency supported, how can i merge the overrides file with sprangular(frontend using angular) ?

thanks..

[FadliKun]

oh sorry my fault...
for the first question,
the fills should be like this (EUR,USD,IDR), without space..

but the second still haven't an idea..