Why am I getting this error at Yahoo domain control panel?

I bought a domain name a couple of years ago at Yahoo and when I last wanted to check the control panel, I came across this error message: "Sorry, there are no Yahoo! Small Business services associated with the Yahoo! ID hamipers" When I do a Whois search, my account at Yahoo still appears to be the... show more I bought a domain name a couple of years ago at Yahoo and when I last wanted to check the control panel, I came across this error message:

"Sorry, there are no Yahoo! Small Business services associated with the Yahoo! ID hamipers"

When I do a Whois search, my account at Yahoo still appears to be the administrator's email address of the domain.
What do you think the problem is? How could I contact Yahoo to resolve this problem?
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