Error message too verbose/cryptic on "Create an Invoice" field validation

As discussed with @Zaxounette on chat.btcpayserver.org, the error message returned after a failed validation of the Currency field on the “Create an Invoice” page is a verbose log that is not suitable for nontechnical end users:

Elsewhere in BTCPay Server, the Currency error message is simple and cogent:

In the interest of improving UI/UX as well as maintaining consistency with other parts of BTCPay Server, a simple “Invalid currency” message should suffice. The detailed error logs above could go in the internal logs (if they are not already).

[pavlenex]

@bolatovumar I think that error message makes sense. Perhaps we should document this as well so we can link to it for more in-depth explanation @Zaxounette @britttttk it’s a common error.

[bolatovumar]

It could be that the current rate provider stopped providing these rates, or is offline.

Yeah, the error message would have to be something generic like “Please make sure you entered a valid currency symbol, rate provider is configured in store settings and your configured rate provider is online and provides rates for your selected currency.”. It’s a bit long but should cover most cases?