[Plugin: s2Member ( Membership w/ PayPal? )] About s2Member pro Billing updation form

Am using s2Member v3.5.6 and s2Member-pro v1.5.6 in my site for payment.

While submitting the billing modification pro-form shows “Please enter username” error, but the form already have the value for username field and it is read only, then why its showing this error.

I don’t know whether i missed any configuration in s2member-pro module.

Thanks in advance

https://www.ads-software.com/extend/plugins/s2member/