FATAL ERROR REVEALED

Error: Call to undefined method ReflectionProperty::isVirtual() in /app/vendor/symfony/var-dumper/Caster/Caster.php:198
Stack trace:
#0 /app/vendor/symfony/var-dumper/Caster/Caster.php(69): Symfony\Component\VarDumper\Caster\Caster::getClassProperties(Object(ReflectionClass))
#1 /app/vendor/symfony/var-dumper/Cloner/AbstractCloner.php(371): Symfony\Component\VarDumper\Caster\Caster::castObject(Object(Error), 'Error', false, 'Error')
#2 /app/vendor/symfony/var-dumper/Cloner/VarCloner.php(127): Symfony\Component\VarDumper\Cloner\AbstractCloner->castObject(Object(Symfony\Component\VarDumper\Cloner\Stub), false)
#3 /app/vendor/symfony/var-dumper/Cloner/AbstractCloner.php(316): Symfony\Component\VarDumper\Cloner\VarCloner->doClone(Object(Error))
#4 /app/vendor/symfony/error-handler/Exception/FlattenException.php(112): Symfony\Component\VarDumper\Cloner\AbstractCloner->cloneVar(Object(Error))
#5 /app/vendor/symfony/error-handler/ErrorRenderer/HtmlErrorRenderer.php(70): Symfony\Component\ErrorHandler\Exception\FlattenException::createWithDataRepresentation(Object(Error), NULL, Array)
#6 /app/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(922): Symfony\Component\ErrorHandler\ErrorRenderer\HtmlErrorRenderer->render(Object(Error))
#7 /app/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(896): Illuminate\Foundation\Exceptions\Handler->renderExceptionWithSymfony(Object(Error), true)
#8 /app/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(871): Illuminate\Foundation\Exceptions\Handler->renderExceptionContent(Object(Error))
#9 /app/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(850): Illuminate\Foundation\Exceptions\Handler->convertExceptionToResponse(Object(Error))
#10 /app/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(741): Illuminate\Foundation\Exceptions\Handler->prepareResponse(Object(Illuminate\Http\Request), Object(Error))
#11 /app/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(628): Illuminate\Foundation\Exceptions\Handler->renderExceptionResponse(Object(Illuminate\Http\Request), Object(Error))
#12 /app/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(574): Illuminate\Foundation\Exceptions\Handler->render(Object(Illuminate\Http\Request), Object(Error))
#13 /app/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(148): Illuminate\Foundation\Http\Kernel->renderException(Object(Illuminate\Http\Request), Object(Error))
#14 /app/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(1220): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request))
#15 /app/public/index.php(21): Illuminate\Foundation\Application->handleRequest(Object(Illuminate\Http\Request))
#16 {main}