How to solve APO warning in Wordpress

Hello, I’ve just bought APO CF but I’ve got an issue with this feature that there is always a warning message from the dashboard which is “cf-edge-cache response header is missing! Please clear any server cache used via other plugins” I have no idea how to solve this issue, The page I need help with: 4allprograms

I have disabled the “WP Fastest Cache” plugin when I enable CF plugin but it seems doesn’t work at all and I still get the same warning message from my Wordpress Dashboard!

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