Por que me sale este error hay alguna forma de solucionarlo

21-Feb-2023 09:58:49] NOTICE: "Undefined index: List"
File: /home/star/web/xnova.nat.cu/public_html/cache/templates/es^307913bc3beab62a83f34fa4abc3d44b4c5e12a8.page.buildings.default.tpl.php | Line: 829
URL: xnova.nat.cu/game.php?page=buildings | Version: 2.3.git
Stack trace:
#0 /cache/templates/es^307913bc3beab62a83f34fa4abc3d44b4c5e12a8.page.buildings.default.tpl.php(829): errorHandler(8, 'Undefined index...', '/home/star/web/...', 829, Array)
#1 /includes/libs/Smarty/sysplugins/smarty_template_resource_base.php(128): content_63f473984016c4_58840534(Object(Smarty_Internal_Template))
#2 /includes/libs/Smarty/sysplugins/smarty_template_cached.php(136): Smarty_Template_Resource_Base->getRenderedTemplateCode(Object(Smarty_Internal_Template))
#3 /includes/libs/Smarty/sysplugins/smarty_internal_template.php(179): Smarty_Template_Cached->render(Object(Smarty_Internal_Template), false)
#4 /includes/libs/Smarty/sysplugins/smarty_internal_templatebase.php(199): Smarty_Internal_Template->render(false, 1)
#5 /includes/libs/Smarty/sysplugins/smarty_internal_templatebase.php(114): Smarty_Internal_TemplateBase->_execute(Object(Smarty_Internal_Template), NULL, NULL, NULL, 1)
#6 /includes/classes/class.template.php(129): Smarty_Internal_TemplateBase->display('extends:layout....')
#7 /includes/pages/game/AbstractGamePage.class.php(315): template->display('extends:layout....')
#8 /includes/pages/game/ShowBuildingsPage.class.php(327): AbstractGamePage->display('page.buildings....')
#9 /game.php(40): ShowBuildingsPage->show()
#10 {main}
NeroBitt: 21. Feb 2023, 09:58:49

linea 829

<input type="hidden" name="building" value="<?php echo $_smarty_tpl->tpl_vars['List']->value['Put'];?>