Magento2: Error mergeMetadataElement() in backend product edit or add

[primisuimotori]

After updating Magento 2.0.7 to 2.1.0 (2.11 and 2.1.2) when I try to edit a product in backend I got this error:

Recoverable Error: Argument 3 passed to Magento\Framework\View\Element\UiComponentFactory::mergeMetadataElement() must be of the type array, null given, called in /var/www/html/[magento_dir]/vendor/magento/framework/View/Element/UiComponentFactory.php on line 337 and defined in /var/www/html/[magento_dir]/vendor/magento/framework/View/Element/UiComponentFactory.php on line 287

[mrkhoa99]

@primisuimotori Tried to remove var/generation folder?

[primisuimotori]

Yes, done. Var and Static (backend) was removed and regenerated, but the errror remains.

[veloraven]

@primisuimotori thank you for feedback.
Please, format this issue according to the Issue reporting guidelines: with steps to reproduce, actual result and expected result.
Please, also identify which version of Magento you are running.

[primisuimotori]

Solve, delete all database table for catalog (product & category) and eav attribute. After that I Imported the empty tables from a clean Magento 2.1.2 installation.

[Ctucker9233]

@primisuimotori That's just not an option if your environment is in production mode with a live site.

[veloraven]

I'm closing this issue as it was resolved.
If this issue still reproducible please feel free to create the new one: format new issue according to the Issue reporting guidelines: with steps to reproduce, actual result and expected result and specify Magento version.

[malachy-mcconnell]

This issue seems to be the same as issue #5350

[keevitaja]

In case anyone comes across with this issue again, then please check if your product does have a valid attribute set. I had the same error when creating products programmatically without attribute set.

[Usman1493]

I migrated the data from magento 1.9.3.7 to magento 2.2.5 using the data migration tool. When I click the add product button through admin panle, it showed me the same error. The way I resolved it was to go to Admin->Store->Attribute Set. And edited theDefault and Migration_Default Attributes Set. Initially the Migration_Default Attribute had the attribute sets but the Default was empty. I added the attributes to the Default Attribute Set and executed the reindex command

sudo php bin/magento indexer:reindex

Also make sure that the Schedule Design Update Group Contains the following attributes:

• custom_design_from
• custom_design_to
• custom_design
• custom_layout

And it worked for me...

[ghost]

Encountered in 2.2.5 using the data migration tool.
In my case, the attribute set was missing.

If you get this error, check your attribute set as @Usman1493 and @keevitaja explained

[omarmohssen]

products without sku in our case caused the problem

[Eddcapone]

Adding

custom_design_from
custom_design_to
custom_design
custom_layout

to the Default Attribute set in the Schedule Design Update Group, and then executing php bin/magento indexer:reindex was solving it for me :)

[Jeeva-Rathinam]

@Eddcapone @Usman1493 I just followed what you said still getting the issue, any help thanks, https://community.magento.com/t5/Magento-2-x-Admin-Configuration/Magento-2-3-After-migrated-from-1-9-2-3-Product-Edit-Page-from/m-p/454147/highlight/false#M5936

[Jeeva-Rathinam]

After updating Magento 2.0.7 to 2.1.0 (2.11 and 2.1.2) when I try to edit a product in backend I got this error:

Recoverable Error: Argument 3 passed to Magento\Framework\View\Element\UiComponentFactory::mergeMetadataElement() must be of the type array, null given, called in /var/www/html/[magento_dir]/vendor/magento/framework/View/Element/UiComponentFactory.php on line 337 and defined in /var/www/html/[magento_dir]/vendor/magento/framework/View/Element/UiComponentFactory.php on line 287

I am getting the same issue, could you pls help me how you solved this issue?