[EC-CUBE] EC-CUBE 4.0.6-p1　正式版（公式DL版)
[レンタルサーバ] GMO　Conohawingサーバ
[OS] Linux web0168.sh.tyo1 3.10.0-962.3.2.lve1.5.39.el7.x86_64 #1 SMP Thu Sep 17 06:10:33 EDT 2020 x86_64 [PHP] PHP 7.3.26
[データベース] MySQL 5.7.27-log
[WEBサーバ] Apache + nginx （バージョン確認方法が分かりません）
[ブラウザ] 有名どころ全て
[導入プラグインの有無] 有り

Amazon Payプラグイン(V2対応版) 1.1.0 AmazonPayV2　状態： 有効
お問い合わせ管理 for EC-CUBE4 1.0.5 ContactManagement4　状態： 有効
Coupon Plugin for EC-CUBE4 4.0.7 Coupon4　状態： 有効
Paidyプラグイン 1.0.5 Paidy4　状態： 有効
Securitychecker4 4.0.0 Securitychecker4　状態： 有効
商品レビュー管理プラグイン 4.0.2
U-KOMI 1.1.1 UKOMI4　状態： 有効
クロネコヤマト　カード・後払い一体型決済サービス 1.2.1 YamatoPayment4　　状態： 有効
EC-CUBE Ranking Plugin 1.0.1 Ranking 状態： 有効


サイトの新規会員登録画面（/root/entry）
から必要事項を埋めて【同意する】ボタンを押すと画面遷移が正常に行われずURIは（/root/entry）のまま500エラーになる。


既存会員のログインや編集、ログアウトなどは正常に働きます。


管理画面からの会員登録は出来るので、テンプレートファイル（/entry/index.twig）に問題があると思うのですが、心当たりが有りません。CSSで項目名の非表示をしているくらいです。


お忙しいところ恐縮ですが、何かしらヒントを指摘いただけますと大変ありがたいです。

どうぞよろしくお願いいたします。
以下はFrontのエラーログになります。大変見づらくて申し訳ございません。



[2021-10-15 11:35:08] app.DEBUG [N/A] [ad50695] [anon.] [Eccube\Log\Logger:log:68] - Commit executed. [] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] app.INFO [N/A] [ad50695] [anon.] [Eccube\Log\Logger:log:68] - PROCESS END ["entry"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.INFO [3836acc9] [ad50695] [anon.] [Eccube\Log\Logger:log:66] - LOGIC END ["entry"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.ERROR [3836acc9] [ad50695] [anon.] [Eccube\Log\Logger:log:66] - システムエラーが発生しました。 ["Type error: Argument 1 passed to Symfony\\Component\\Form\\FormRenderer::searchAndRenderBlock() must be an instance of Symfony\\Component\\Form\\FormView, null given, called in /root/var/cache/prod/twig/42/4274ea4cd8da5d298b470ea4b0cab7e6b1380c271a52f2170d6ba745d9df21a5.php on line 316","/root/vendor/symfony/form/FormRenderer.php",131,"#0 /root/var/cache/prod/twig/42/4274ea4cd8da5d298b470ea4b0cab7e6b1380c271a52f2170d6ba745d9df21a5.php(316): Symfony\\Component\\Form\\FormRenderer->searchAndRenderBlock(NULL, 'label', Array)\n#1 /root/vendor/twig/twig/src/Template.php(184): __TwigTemplate_1c839d09f5ffd3ffbe546e2760ed5cc5cb7454aab1d6659d3e575b8a8f36c93b->block_main(Array, Array)\n#2 /root/var/cache/prod/twig/79/79d96981b9b975487e4b902d428fe84d8699631d68198f3c117afdf485cad6bd.php(519): Twig\\Template->displayBlock('main', Array, Array)\n#3 /root/vendor/twig/twig/src/Template.php(407): __TwigTemplate_588e2aaaed6971cb5d1d43a3cc165147f23c06bb4a0a4e1b1ba74514838da735->doDisplay(Array, Array)\n#4 /root/vendor/twig/twig/src/Template.php(380): Twig\\Template->displayWithErrorHandling(Array, Array)\n#5 /root/src/Eccube/Twig/Template.php(40): Twig\\Template->display(Array, Array)\n#6 /root/var/cache/prod/twig/42/4274ea4cd8da5d298b470ea4b0cab7e6b1380c271a52f2170d6ba745d9df21a5.php(47): Eccube\\Twig\\Template->display(Array, Array)\n#7 /root/vendor/twig/twig/src/Template.php(407): __TwigTemplate_1c839d09f5ffd3ffbe546e2760ed5cc5cb7454aab1d6659d3e575b8a8f36c93b->doDisplay(Array, Array)\n#8 /root/vendor/twig/twig/src/Template.php(380): Twig\\Template->displayWithErrorHandling(Array, Array)\n#9 /root/src/Eccube/Twig/Template.php(40): Twig\\Template->display(Array, Array)\n#10 /root/vendor/twig/twig/src/Template.php(392): Eccube\\Twig\\Template->display(Array)\n#11 /root/vendor/symfony/twig-bridge/TwigEngine.php(50): Twig\\Template->render(Array)\n#12 /root/vendor/symfony/framework-bundle/Controller/ControllerTrait.php(286): Symfony\\Bridge\\Twig\\TwigEngine->render('Entry/confirm.t...', Array)\n#13 /root/src/Eccube/Controller/EntryController.php(154): Symfony\\Bundle\\FrameworkBundle\\Controller\\Controller->render('Entry/confirm.t...', Array)\n#14 /root/vendor/symfony/http-kernel/HttpKernel.php(151): Eccube\\Controller\\EntryController->index(Object(Symfony\\Component\\HttpFoundation\\Request))\n#15 /root/vendor/symfony/http-kernel/HttpKernel.php(68): Symfony\\Component\\HttpKernel\\HttpKernel->handleRaw(Object(Symfony\\Component\\HttpFoundation\\Request), 1)\n#16 /root/vendor/symfony/http-kernel/Kernel.php(200): Symfony\\Component\\HttpKernel\\HttpKernel->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#17 /root/index.php(76): Symfony\\Component\\HttpKernel\\Kernel->handle(Object(Symfony\\Component\\HttpFoundation\\Request))\n#18 {main}"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] php.CRITICAL [3836acc9] [ad50695] [anon.] [Symfony\Component\Debug\ErrorHandler:handleException:584] - Type error: Argument 1 passed to Symfony\Component\Form\FormRenderer::searchAndRenderBlock() must be an instance of Symfony\Component\Form\FormView, null given, called in /root/var/cache/prod/twig/42/4274ea4cd8da5d298b470ea4b0cab7e6b1380c271a52f2170d6ba745d9df21a5.php on line 316 {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\FatalThrowableError(code: 0): Type error: Argument 1 passed to Symfony\\Component\\Form\\FormRenderer::searchAndRenderBlock() must be an instance of Symfony\\Component\\Form\\FormView, null given, called in /root/var/cache/prod/twig/42/4274ea4cd8da5d298b470ea4b0cab7e6b1380c271a52f2170d6ba745d9df21a5.php on line 316 at /root/vendor/symfony/form/FormRenderer.php:131)"} [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.INFO [3836acc9] [ad50695] [anon.] [Eccube\Log\Logger:log:66] - 会員登録確認完了 [] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.INFO [3836acc9] [ad50695] [anon.] [Eccube\Log\Logger:log:66] - 会員登録確認開始 [] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.INFO [3836acc9] [ad50695] [anon.] [Eccube\Log\Logger:log:66] - LOGIC START ["entry"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.DEBUG [3836acc9] [ad50695] [anon.] [Eccube\Log\Logger:log:66] - Begin Transaction. [] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.INFO [3836acc9] [ad50695] [anon.] [Eccube\Log\Logger:log:66] - PROCESS START ["entry"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:35:08] front.INFO [N/A] [ad50695] [N/A] [Eccube\Log\Logger:log:66] - INIT [] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:30:28] app.INFO [N/A] [c8183d3] [anon.] [Eccube\Log\Logger:log:68] - PROCESS END ["entry"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:30:28] front.INFO [3836acc9] [c8183d3] [anon.] [Eccube\Log\Logger:log:66] - LOGIC END ["entry"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:30:28] php.WARNING [3836acc9] [c8183d3] [anon.] [Symfony\Component\Debug\ErrorHandler:handleError:532] - Warning: preg_match(): Delimiter must not be alphanumeric or backslash {"exception":"[object] (ErrorException(code: 0): Warning: preg_match(): Delimiter must not be alphanumeric or backslash at /root/var/cache/prod/twig/79/79d96981b9b975487e4b902d428fe84d8699631d68198f3c117afdf485cad6bd.php:588)"} [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]
[2021-10-15 11:30:28] front.INFO [3836acc9] [c8183d3] [anon.] [Eccube\Log\Logger:log:66] - LOGIC START ["entry"] [POST, /root/entry, IP, https://root/entry, Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36]