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^ hmm., above information doesn't help much.
if you are not comfortable in posting your forum (feed) URL on open forum then you can PM me

the error could be caused by a plugin or 3rd party code - have you tried disabling all the plugins ?

admin panel >> configuration >> settings >> General Configuration --> Disable All Plugins --> select yes & save settings

i had found the problem

the problem is "cloudflare"

thanks all for try answerd my question

thanks.......