I'm not sure if anyone has experienced similar problem, but ever since last week my credit are no longer accessible.

When finishing the purchase, enter credit number (reservation number) and email seems to be able to pull out the credit correctly.

But when click 'Apply' button, the webpage become frozen for a while and returned the message: 'IInstallment value must be specified. Requested: 0, Maximum: 1, Override: 0'

Anyone has seen similar thing? Has this happened before?