There may be some causes.
The input mistake of ID or password
Please confirm again the spelling of a password, ID, capital letters / lower-case character
Since especially a password has many input mistakes, please copy, paste and see what was inputted on the memo pad etc.
The term-of-validity lapse of a card.
Please confirm the term of validity of a card. s
When the state which cannot be logged in continues, if you ask below, it can solve early most.
All inquiries about the contents of a claim of a credit card is to the following.
'ZERO' customer support E-mail:
creditinfo@zeroweb.co.jp
Support centerTEL:03-3498-6200
(Tokyo Japan 365-day correspondence [ 24 hour ])