Please double check your IBAN with your bank. IBANs have 2 letters followed by numbers. The amount of numbers will vary from one country to the other. If in doubt, contact your bank to review it.
Please visit the following webpage to view some IBAN examples per country:
www.iban.com/structure
You can also use this page to make sure the IBAN information you got is correct:
www.ibancalculator.com