Not a Bug always get this error, is it a bug?

ErrorException: file_get_contents(http://finance.yahoo.com/d/quotes.csv?s=NOKCAD=X&f=sl1d1t1): failed to open stream: HTTP request failed! -library/NFLJ/StockTrader/Model/CurrencyExchange.php:60
生成于: 未知账号, 30 分钟之前
Stack 跟踪
#0 [internal function]: XenForo_Application::handlePhpError(2, 'file_get_conten...', '/home/laomagua/...', 60, Array)
#1 /home/laomagua/public/bbsmit.org/public/library/NFLJ/StockTrader/Model/CurrencyExchange.php(60): file_get_contents('http://finance....')
#2 /home/laomagua/public/bbsmit.org/public/library/NFLJ/StockTrader/CronEntry/Currency.php(14): NFLJ_StockTrader_Model_CurrencyExchange->fetchCurrencyExchangeRates('CAD', 'H')
#3 [internal function]: NFLJ_StockTrader_CronEntry_Currency::updateCurrencyExchangeRates(Array)
#4 /home/laomagua/public/bbsmit.org/public/library/XenForo/Model/Cron.php(356): call_user_func(Array, Array)
#5 /home/laomagua/public/bbsmit.org/public/library/XenForo/Deferred/Cron.php(24): XenForo_Model_Cron->runEntry(Array)
#6 /home/laomagua/public/bbsmit.org/public/library/XenForo/Model/Deferred.php(243): XenForo_Deferred_Cron->execute(Array, Array, 9.999988079071, '')
#7 /home/laomagua/public/bbsmit.org/public/library/XenForo/Model/Deferred.php(369): XenForo_Model_Deferred->runDeferred(Array, 9.999988079071, '', false)
#8 /home/laomagua/public/bbsmit.org/public/library/XenForo/Model/Deferred.php(322): XenForo_Model_Deferred->_runInternal(Array, NULL, '', false)
#9 /home/laomagua/public/bbsmit.org/public/deferred.php(18): XenForo_Model_Deferred->run(false)
#10 {main}
请求状态
array(3) {
["url"] => string(34) "http://bbs.bbsmit.org/deferred.php"
["_GET"] => array(0) {
}
["_POST"] => array(4) {
["_xfRequestUri"] => string(10) "/index.php"
["_xfNoRedirect"] => string(1) "1"
["_xfToken"] => string(8) "********"
["_xfResponseType"] => string(4) "json"
}
}