You can get this error if You are uploading file via post parameters, and it’s bigger than allowed size.

[warn] [client 123.123.123.123] mod_fcgid: stderr: PHP Warning:  POST Content-Length of 12430806 bytes exceeds the limit of 10485760 bytes in Unknown on line 0, referer: http://www.yoursite.tld/index.php?phpparams

In php.ini file You should set bigger limits.

post_max_size = 32M
upload_max_filesize = 32M

and reload apache

service httpd reload