Subscription ERROR

Hi,

There are problems with the subscriptions, the Error log shows these messages (it worked perfectly well before):

ERROR: Form 729 > MailChimp API error: 400 Bad Request. Member In Compliance State. bala**@7d*****.net is already a list member in compliance state due to unsubscribe, bounce, or compliance review.
Request: PUT https://us8.api.mailchimp.com/3.0/lists/*******/members/070e3b6fc4c8888b3144b62d82df89a6 – {“email_address”:”ba****@7d*****.net”,”interests”:{},”merge_fields”:{“FNAME”:”rere”},”status”:”pending”,”email_type”:”html”,”ip_signup”:”***”}
Response: 400 Bad Request – {“type”:”http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/”,”title”:”Member In Compliance State”,”status”:400,”detail”:”ba****@7d*****.net is already a list member in compliance state due to unsubscribe, bounce, or compliance review.”,”instance”:”97220194-38d1-4b6d-8cea-deea9ddee594″}

and this:

ERROR: WooCommerce Checkout > MailChimp API Error: Bad Request. Member In Compliance State. tibo****@gm***.com is in a compliance state due to unsubscribe, bounce, or compliance review and cannot be subscribed.
Request: PUT https://us8.api.mailchimp.com/3.0/lists/********/members/78f6e4828f2f7515bebf151a533ea236 – {“email_address”:”tibo****@gm***.com”,”interests”:{},”merge_fields”:{“FNAME”:”Tibor”},”status”:”subscribed”,”email_type”:”html”,”ip_signup”:”*******”}
Response: 400 Bad Request – {“type”:”http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/”,”title”:”Member In Compliance State”,”status”:400,”detail”:”tibo****@gm***.com is in a compliance state due to unsubscribe, bounce, or compliance review and cannot be subscribed.”,”instance”:”f0db42f6-7e4f-4761-9528-0937435b0621″}

What could be the problem?

Thanks in advance!