Fatal error: Call to a member function getConfigDependencyName() on a non-object in FieldConfigBase.php

I disabled almost all of the unwanted modules in D6 site and enabled almost all the modules in D8 site. But I am still getting the same issue.

Yes, I have latest versions from GIT D6, D8 and Migrate Upgrade.

Now I re-installed both the sites. Generated only 10 users using Devel in D6. Migration again failed with following error,

An AJAX HTTP error occurred.
HTTP Result Code: 500
Debugging information follows.
Path: /batch?id=2&op=do_nojs&op=do
StatusText: Internal Server Error
ResponseText: {"error":"A fatal error occurred: The \u0022book\u0022 plugin does not exist."}

Regarding #5,

When I looked into the migrate_upgrade code, I noticed that it does the migration based on migrate.config.yml and migrate.content.yml files. As 'book' plugin was disabled on default install of both the sites, it gave the error (#5).

I commented out 'd6_book' and other stuff except 'd6_user' in migrate.content.yml file and migration worked perfectly fine for 'users' as I am trying the migration for one entity at a time.

Not sure why is the Fatal Error related to the UI and not the migration itself. I am still getting the same fatal error when I run it from command line,

drush migrate-manifest manifest.yml --legacy-db-url=mysql://drupaluser:@127.0.0.1:33067/d6

I have taken the manifest file from https://www.drupal.org/files/issues/D6Manifest-Complete.yml.

Attaching here complete migration log from the command line.

Taxonomies and users are migrated along with site settings. But I am still not able to migrate nodes.

I updated the D8 code through GIT, reinstalled D8 site and then enabled almost al the modules in D8. Even then I am getting the same error "Fatal error: Call to a member function getConfigDependencyName() on a non-object in /d8/core/lib/Drupal/Core/Field/FieldConfigBase.php on line 252".

I tried it again. I updated my D8 code through GIT. Re-installed my D8 site and then enabled all the modules.

I ran the migration using Migration Upgrade module and got the following error,

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /batch?id=3&op=do_nojs&op=do
StatusText: OK
ResponseText: 
( ! ) Fatal error: Call to a member function getConfigDependencyName() on a non-object in /core/lib/Drupal/Core/Entity/EntityDisplayBase.php on line 165
Call Stack
#TimeMemoryFunctionLocation
10.0003145412{main}(  )../index.php:0
20.02491243936Drupal\Core\DrupalKernel->handle(  )../index.php:24
30.12715180748Stack\StackedHttpKernel->handle(  )../DrupalKernel.php:577
40.12715180852Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(  )../StackedHttpKernel.php:23
50.12715180912Drupal\ban\BanMiddleware->handle(  )../ReverseProxyMiddleware.php:58
60.12775181156Drupal\Core\StackMiddleware\PageCache->handle(  )../BanMiddleware.php:55
70.15385921516Drupal\Core\StackMiddleware\KernelPreHandle->handle(  )../PageCache.php:52
80.22759367960Symfony\Component\HttpKernel\HttpKernel->handle(  )../KernelPreHandle.php:53
90.22759368208Symfony\Component\HttpKernel\HttpKernel->handleRaw(  )../HttpKernel.php:66
100.339812930628call_user_func_array:{/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/HttpKernel.php:145}
(  )../HttpKernel.php:145
110.339812930840Drupal\system\Controller\BatchController->batchPage(  )../HttpKernel.php:145
120.341312987008_batch_page(  )../BatchController.php:60
130.359414505156_batch_do(  )../batch.inc:83
140.359414505312_batch_process(  )../batch.inc:101
150.361214560072call_user_func_array:{/core/includes/batch.inc:256}
(  )../batch.inc:256
160.361814587272Drupal\migrate_upgrade\MigrateUpgradeRunBatch::run(  )../batch.inc:256
170.685420351012Drupal\migrate\MigrateExecutable->import(  )../MigrateUpgradeRunBatch.php:38
183.103425727308Drupal\migrate\Plugin\migrate\destination\ComponentEntityDisplayBase->import(  )../MigrateExecutable.php:285
193.155925738872Drupal\Core\Entity\Entity->save(  )../ComponentEntityDisplayBase.php:34
203.155925738872Drupal\Core\Config\Entity\ConfigEntityStorage->save(  )../Entity.php:325
213.156025738928Drupal\Core\Entity\EntityStorageBase->save(  )../ConfigEntityStorage.php:232
223.161625739648Drupal\Core\Entity\EntityDisplayBase->preSave(  )../EntityStorageBase.php:395
233.161625739676Drupal\Core\Config\Entity\ConfigEntityBase->preSave(  )../EntityDisplayBase.php:150
243.169425752168Drupal\Core\Entity\EntityDisplayBase->calculateDependencies(  )../ConfigEntityBase.php:309

Finally there were no Fatal errors!

As usual, I did git pull for both D8 and Migrate Upgrade module. Reinstalled D8 site and enabled most of the modules. Performed D6 to D8 migration using Migrate Upgrade module.

During migration it reported some missing bundles but no fatal errors. I checked and found that Users / Vocabularies / Terms have been migrated successfully. Migration also created Page and Story content types but both were having just one field called Body. I think that's the reason no content and comments have been migrated.

Although there are no fatal errors now but I am still not able migrate the content.