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Error Message: Security Message Not Valid

Member

Error Message: Security Message Not Valid

In setting up a new blog site using Word Press and Paid Membership Pro Plug In, I have entered the API signature, password, and ID, but when I test the PayPal Button, I get the error message above. Note: I am working in newsite.britainstreetblog.com and have never started a Pay Pal account for that site. Any ideas to correct this problem?