jetpack
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i am getting the error message
[error] FastCGI sent in stderr: "PHP message: PHP Warning: json_encode(): Invalid UTF-8 sequence in argument in .../wp-cache-phase2.php on line 55" while reading response header from upstream, client: 11.22.33.44, server: www.site.com, request: "GET /search/?s=r%F6rek+ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "http://www.site.com", referrer: "http://www.site.com/post"