Paypal Error code=AMOUNT_ERROR

I am getting "Things don't appear to be working at the moment. Please try again later."
The Url show: 'Error code=AMOUNT_ERROR'
Does anyone faced that error?

most likely an issue with the currency format, see this post: https://www.nopcommerce.com/en/boards/topic/47030/issue-with-paypal-standard-plugin#186599

Yes, it's related to the curency...
I debugged with fiddler and copy the URL that sent to PayPal.
When I change the currency_code=ils (Israeli Shekel) to USD it works...
Now I need to know how to make this work with my currency

These are the accepted currencies coded for paypal:
https://developer.paypal.com/docs/api/reference/currency-codes/

I just had to write 'ils" with capital letters (ILS) and the error is gone.