Calendar display error

[ThRPctmylSgltwH]

I am running webtrees in docker (image: ghcr.io/nathanvaughn/webtrees:latest) and receive the following error on the page when I try to display a calendar. Day, week and month all display the same error.

Unsupported operand types: string * int …/app/Http/RequestHandlers/CalendarPage.php:87
#0 …/app/Http/Middleware/WrapHandler.php(83): Fisharebest\Webtrees\Http\RequestHandlers\CalendarPage->handle(Object(Nyholm\Psr7\ServerRequest))
#1 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\WrapHandler->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#2 …/app/Module/HitCountFooterModule.php(157): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#3 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Module\HitCountFooterModule->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#4 …/app/Http/Middleware/CheckCsrf.php(75): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#5 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\CheckCsrf->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#6 …/vendor/oscarotero/middleland/src/Dispatcher.php(118): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#7 …/app/Http/Middleware/Router.php(166): Middleland\Dispatcher->dispatch(Object(Nyholm\Psr7\ServerRequest))
#8 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\Router->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#9 …/app/Http/Middleware/BootModules.php(62): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#10 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\BootModules->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#11 …/app/Http/Middleware/LoadRoutes.php(76): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#12 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\LoadRoutes->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#13 …/app/Http/Middleware/UseTransaction.php(45): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#14 …/vendor/illuminate/database/Concerns/ManagesTransactions.php(29): Fisharebest\Webtrees\Http\Middleware\UseTransaction::Fisharebest\Webtrees\Http\Middleware{closure}(Object(Illuminate\Database\MySqlConnection))
#15 …/app/Http/Middleware/UseTransaction.php(46): Illuminate\Database\Connection->transaction(Object(Closure), 3)
#16 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\UseTransaction->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#17 …/app/Http/Middleware/DoHousekeeping.php(74): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#18 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\DoHousekeeping->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#19 …/app/Http/Middleware/UseTheme.php(70): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#20 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\UseTheme->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#21 …/app/Http/Middleware/CheckForMaintenanceMode.php(51): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#22 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\CheckForMaintenanceMode->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#23 …/app/Http/Middleware/UseLanguage.php(70): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#24 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\UseLanguage->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#25 …/app/Http/Middleware/UseSession.php(71): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#26 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\UseSession->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#27 …/app/Http/Middleware/UpdateDatabaseSchema.php(58): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#28 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\UpdateDatabaseSchema->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#29 …/app/Http/Middleware/UseDebugbar.php(67): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#30 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\UseDebugbar->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#31 …/app/Http/Middleware/UseDatabase.php(117): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#32 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\UseDatabase->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#33 …/app/Http/Middleware/BadBotBlocker.php(223): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#34 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\BadBotBlocker->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#35 …/app/Http/Middleware/CompressResponse.php(75): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#36 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\CompressResponse->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#37 …/app/Http/Middleware/RegisterFactories.php(74): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#38 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\RegisterFactories->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#39 …/vendor/middlewares/client-ip/src/ClientIp.php(81): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#40 …/app/Http/Middleware/ClientIp.php(47): Middlewares\ClientIp->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#41 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\ClientIp->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#42 …/app/Http/Middleware/HandleExceptions.php(90): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#43 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\HandleExceptions->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#44 …/app/Http/Middleware/BaseUrl.php(77): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#45 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\BaseUrl->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#46 …/app/Http/Middleware/ReadConfigIni.php(69): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#47 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\ReadConfigIni->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#48 …/app/Http/Middleware/SecurityHeaders.php(48): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#49 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\SecurityHeaders->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#50 …/app/Http/Middleware/EmitResponse.php(57): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#51 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\EmitResponse->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#52 …/app/Http/Middleware/PhpEnvironment.php(49): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#53 …/vendor/oscarotero/middleland/src/Dispatcher.php(136): Fisharebest\Webtrees\Http\Middleware\PhpEnvironment->process(Object(Nyholm\Psr7\ServerRequest), Object(Middleland\Dispatcher))
#54 …/vendor/oscarotero/middleland/src/Dispatcher.php(118): Middleland\Dispatcher->handle(Object(Nyholm\Psr7\ServerRequest))
#55 …/index.php(57): Middleland\Dispatcher->dispatch(Object(Nyholm\Psr7\ServerRequest))
#56 {main}

The docker log in Portainer displays this
webtrees:80 172.17.0.1 - - [12/Oct/2021:18:05:28 +0000] "GET /tree/falcigno/calendar/year HTTP/1.1" 500 53969 "https://webtrees.falcigno.tk/tree/falcigno/calendar/month" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.71 Safari/537.36 Edg/94.0.992.38",

Thanks.

[fisharebest]

You are using webtrees 2.0.x with PHP 8.0

webtrees 2.0 requires PHP 7.1 -> PHP 7.4

Support for PHP 8.0 will come with webtrees 2.1.

If you cannot use PHP 7.4, then you can use the latest code from the main branch (which is compatible with PHP 8).
It is pretty stable. You just need to install the dependencies using composer install --no-dev.