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There has been an error processing your request Exception printing is disabled by default for securi

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There has been an error processing your request Exception printing is disabled by default for securi

Anyone know what happens ? My magento is 2.3.4  , this is happened after i installed a theme, the website is normal .but when i only open /admin/  it shows this 

There has been an error processing your request Exception printing is disabled by default for secure......

and here is the error code 

1 exception(s):
Exception #0 (OutOfRangeException): Specified invalid parent id (Magento_Backend::mgs)

Exception #0 (OutOfRangeException): Specified invalid parent id (Magento_Backend::mgs)
<pre>#1 Magento\Backend\Model\Menu\Builder\Interceptor->___callParent('getResult', array(&Magento\Backend\Model\Menu#00000000055f6116000000004505f984#)) called at [vendor/magento/framework/Interception/Interceptor.php:138]
#2 Magento\Backend\Model\Menu\Builder\Interceptor->Magento\Framework\Interception\{closure}(&Magento\Backend\Model\Menu#00000000055f6116000000004505f984#) called at [vendor/magento/framework/Interception/Interceptor.php:153]
#3 Magento\Backend\Model\Menu\Builder\Interceptor->___callPlugins('getResult', array(&Magento\Backend\Model\Menu#00000000055f6116000000004505f984#), array(array('SetupMenuBuilder'))) called at [generated/code/Magento/Backend/Model/Menu/Builder/Interceptor.php:39]
#4 Magento\Backend\Model\Menu\Builder\Interceptor->getResult(&Magento\Backend\Model\Menu#00000000055f6116000000004505f984#) called at [vendor/magento/module-backend/Model/Menu/Config.php:148]
#5 Magento\Backend\Model\Menu\Config->_initMenu() called at [vendor/magento/module-backend/Model/Menu/Config.php:111]
#6 Magento\Backend\Model\Menu\Config->getMenu() called at [vendor/magento/module-backend/Model/Url.php:365]
#7 Magento\Backend\Model\Url->_getMenu() called at [vendor/magento/module-backend/Model/Url.php:325]
#8 Magento\Backend\Model\Url->getStartupPageUrl() called at [vendor/magento/module-backend/App/AbstractAction.php:281]
#9 Magento\Backend\App\AbstractAction->_processUrlKeys() called at [generated/code/Magento/Backend/Controller/Adminhtml/Index/Index/Interceptor.php:50]
#10 Magento\Backend\Controller\Adminhtml\Index\Index\Interceptor->_processUrlKeys() called at [vendor/magento/module-backend/App/Request/BackendValidator.php:175]
#11 Magento\Backend\App\Request\BackendValidator->validate(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#, &Magento\Backend\Controller\Adminhtml\Index\Index\Interceptor#00000000055f6297000000004505f984#) called at [vendor/magento/framework/App/Request/CompositeValidator.php:40]
#12 Magento\Framework\App\Request\CompositeValidator->validate(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#, &Magento\Backend\Controller\Adminhtml\Index\Index\Interceptor#00000000055f6297000000004505f984#) called at [vendor/magento/framework/App/FrontController.php:137]
#13 Magento\Framework\App\FrontController->processRequest(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#, &Magento\Backend\Controller\Adminhtml\Index\Index\Interceptor#00000000055f6297000000004505f984#) called at [vendor/magento/framework/App/FrontController.php:98]
#14 Magento\Framework\App\FrontController->dispatch(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#) called at [vendor/magento/framework/Interception/Interceptor.php:58]
#15 Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', array(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#)) called at [vendor/magento/framework/Interception/Interceptor.php:138]
#16 Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#) called at [vendor/magento/framework/Interception/Interceptor.php:153]
#17 Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', array(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#), array(array('default_store_se...', 'page_cache_from_...', 'storeCookieValid...', 'install', 'configHash'))) called at [generated/code/Magento/Framework/App/FrontController/Interceptor.php:26]
#18 Magento\Framework\App\FrontController\Interceptor->dispatch(&Magento\Framework\App\Request\Http#00000000055f6570000000004505f984#) called at [vendor/magento/framework/App/Http.php:116]
#19 Magento\Framework\App\Http->launch() called at [generated/code/Magento/Framework/App/Http/Interceptor.php:24]
#20 Magento\Framework\App\Http\Interceptor->launch() called at [vendor/magento/framework/App/Bootstrap.php:261]
#21 Magento\Framework\App\Bootstrap->run(&Magento\Framework\App\Http\Interceptor#00000000055f6440000000004505f984#) called at [index.php:39]
</pre>

any one know where is problem .and how to fix it ? highly appreciate