This error message will appear in Online Express when a donation form has been placed on a web page that does not have SSL enabled.
It is first indicated as a Security warning on the form:
Clicking on the Security warning opens a new window with the full message and webpage(s):
Make sure the web pages where you are placing your Online Express donation form are SSL-enabled. Please refer to the following for more information on SSL: Security and Online Express
It is important to note that once the Online Express donation form has been placed on the SSL-enabled web page, this error may continue to appear in Online Express for up to three days. The Online Express code checks for non-SSL page loads over the past three days. This error message will expire and disappear from Online Express after that time period has passed.