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Call to a member function access() on null in …BlockAccessControlHandler.php

I am getting two errors on my local Drupal 8 site.

First error: “The website encountered an unexpected error. Please try again later.”

Second error: “Fatal error: Call to a member function access() on a non-object in …blocksrcBlockAccessControlHandler.php on line 124”

First error I get when php version is 7. Second error I get when php version is 5.

BlockAccessControlHandler.php:

      elseif ($this->resolveConditions($conditions, 'and') !== FALSE) {     // Delegate to the plugin.     $block_plugin = $entity->getPlugin();     try {       if ($block_plugin instanceof ContextAwarePluginInterface) {         $contexts = $this->contextRepository->getRuntimeContexts(array_values($block_plugin->getContextMapping()));         $this->contextHandler->applyContextMapping($block_plugin, $contexts);       }       $access = $block_plugin->access($account, TRUE);     }     catch (MissingValueContextException $e) {       // The contexts exist but have no value. Deny access without       // disabling caching.       $access = AccessResult::forbidden();     }

Line 124:

  $access = $block_plugin->access($account, TRUE);

I am not sure how to fix it. How can I fix the above errors so I can launch my site?

Update

Added the code in settings. php and then reloaded the page.

$config['system.logging']['error_level'] = 'verbose';

The website encountered an unexpected error. Please try again later. Error: Call to a member function access() on null in DrupalblockBlockAccessControlHandler->checkAccess() (line 124 of coremodulesblocksrcBlockAccessControlHandler.php).

DrupalblockBlockAccessControlHandler->checkAccess(Object, 'view', Object) (Line: 105) DrupalCoreEntityEntityAccessControlHandler->access(Object, 'view', Object, 1) (Line: 365) DrupalCoreEntityEntity->access('view', NULL, 1) (Line: 56) DrupalblockBlockRepository->getVisibleBlocksPerRegion(Array) (Line: 137) DrupalblockPluginDisplayVariantBlockPageVariant->build() (Line: 259) DrupalCoreRenderMainContentHtmlRenderer->prepare(Array, Object, Object) (Line: 117) DrupalCoreRenderMainContentHtmlRenderer->renderResponse(Array, Object, Object) (Line: 90) DrupalCoreEventSubscriberMainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) call_user_func(Array, Object, 'kernel.view', Object) (Line: 111) DrupalComponentEventDispatcherContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156) SymfonyComponentHttpKernelHttpKernel->handleRaw(Object, 1) (Line: 68) SymfonyComponentHttpKernelHttpKernel->handle(Object, 1, 1) (Line: 57) DrupalCoreStackMiddlewareSession->handle(Object, 1, 1) (Line: 47) DrupalCoreStackMiddlewareKernelPreHandle->handle(Object, 1, 1) (Line: 99) Drupalpage_cacheStackMiddlewarePageCache->pass(Object, 1, 1) (Line: 78) Drupalpage_cacheStackMiddlewarePageCache->handle(Object, 1, 1) (Line: 47) DrupalCoreStackMiddlewareReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52) DrupalCoreStackMiddlewareNegotiationMiddleware->handle(Object, 1, 1) (Line: 23) StackStackedHttpKernel->handle(Object, 1, 1) (Line: 669) DrupalCoreDrupalKernel->handle(Object) (Line: 22)
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Call to a member function access() on null in …BlockAccessControlHandler.php

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