Fatal error

How I understand the log file – the reason of error – /themes/enigma/

Please help with this.

[Sun Oct 18 04:13:59 2015] [error] [client 176.77.62.230] PHP Catchable fatal error:  Object of class WP_Error could not be converted to string in /var/www/miscanthus/data/www/miscanthus-biotech.com/wp-content/themes/enigma/functions.php on line 236, referer: https://yandex.ru/clck/jsredir?from=yandex.ru%3Bsearch%3Bweb%3B%3B&text=&etext=844.jMbd75b1VHWjhJ4QFxs-1lKFG5zoqmez5Q77UFrSGLE-9I3CoEmPKaVslPjyknSL.8a301f75c4c45b84e4c2b5485a93edfeb466ce5b&uuid=&state=AiuY0DBWFJ4ePaEse6rgeAjgs2pI3DW9J0KiE5XNXd0dp0ZMwFHoviUoYa6nzP7MFsomsouu4qfQNbBQjMf13CwoEaY6gr3iFtXfVfwKqvmLDyfSEbMnhqN0Q33R0g7xWXY-UHNuKk1OhTaYi0vtwhAVZxfDW0P5OUSImd0Ft1ZKWyngYMTAkpmAL8-rACzwO7ZtP15X7KoZDChefAKALQ&data=UlNrNmk5WktYejR0eWJFYk1LdmtxcGxGbWJEWEJrUU9HQnlTeHpKanpjQWlYMmZfeGEwTjE4THRkTFltOFpRMFVoOGhfZno3bDZLeVh1T3JlM3hFRHJSby1vYXZjTFdJRFdScWEtWTZaYjRKNFlrb1oxamM3ZUp6dGM3YnhzMFAxMEVKbVF5aWNhUQ&b64e=2&sign=bca8e37193d285d4f2e2a4c03687e186&keyno=0&l10n=ru&cts=1445130348229&mc=5.13449503896
[Sun Oct 18 04:13:59 2015] [error] [client 176.14.106.145] PHP Catchable fatal error:  Object of class WP_Error could not be converted to string in /var/www/miscanthus/data/www/miscanthus-biotech.com/wp-content/themes/enigma/functions.php on line 236, referer: https://yandex.ru/clck/jsredir?from=yandex.ru%3Bsearch%3Bweb%3B%3B&text=&etext=844.bVu5WOks9CpqGJAR9ejjFXwWGvFShbei2wKDwUO-Y8Tek9fq572Kl3ppxzVM2qZJ.d46d5db887fa4f7e395c561e2dc76518ca26a005&uuid=&state=AiuY0DBWFJ4ePaEse6rgeAjgs2pI3DW9J0KiE5XNXd0dp0ZMwFHoviUoYa6nzP7MFsomsouu4qcAjJn2EjgWbU1T3wEVVCad3FNuhA1lADbt6FjVaYeNXvBvzATChqBa3w5pI7wh8Shye-X2i1YTxcAxP3xTQ8UXilRfRPPFZf7YZ6Z3xY35JsI4fCg-0kdfw51HN4-QlvCYOXeYGepzaA&data=UlNrNmk5WktYejR0eWJFYk1LdmtxcGxGbWJEWEJrUU9HQnlTeHpKanpjQWlYMmZfeGEwTjE4THRkTFltOFpRMFVoOGhfZno3bDZKOXJ5SFRLYlYwODBDcE93WUlfTW5vUWxLVmRLVkR2SFo4enI0dVZNNjBlTm1pdXdPNUtjc2ktVzZWUVZDNE9Tcw&b64e=2&sign=34d0830d807938420ee1970a65616d59&keyno=0&l10n=ru&cts=1445130348228&mc=6.16539518629
2015/10/18 05:36:01 [warn] 1196#0: *3495 an upstream response is buffered to a temporary file /var/cache/nginx/proxy_temp/9/02/0000000029 while reading upstream, client: 188.255.99.118, server: miscanthus-biotech.com, request: "GET /wp-content/themes/enigma/css/font-awesome-4.3.0/fonts/fontawesome-webfont.eot? HTTP/1.0", upstream: "https://127.0.0.1:8080/wp-content/themes/enigma/css/font-awesome-4.3.0/fonts/fontawesome-webfont.eot?", host: "miscanthus-biotech.com", referrer: "https://miscanthus-biotech.com/"