Hi Takashi and Nemo,
Sorry for the delay on this matter, I had to double check with our donor services team. Based on the information I got, I have added the following documentation for regarding this message. I hope this clarifies.
This message is intended to address a Global Collect error we see in which the iframe either does not load or gives donors an error message. This is usually due to not having Javascript installed, using an unsupported browser (usually some version of Internet Explorer), or having strict whitelisting settings on their browser.
Thank you very much for all your valuable help.
Kind regards,
Jessica