Sometimes the webservice for updating the currency exchange rates is not available and you might get the WARNING: Cannot retrieve rate from… error by mail or in some log file.

This problem can be solved with the free FixerIOCurrencyImport extension.

Solving the “Cannot retrieve rate from” error
You want or need help implementing this solution? Maybe you did not find what you were looking for? Contact me and I will assist you with whatever Magento problem troubles you!