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

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

     

    error: Naughty, Naughty. Content is protected !!