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Marius
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That happens when the source of the attribute is misconfigured, or the entity_type of that attribute is not set.

Search in your database, in the table eav_attribute your attribute by attribute_code and take a look if the entity_type is correct (for example, catalog_product, in case of product attributes).

SELECT entity_type_id, backend_model, source_model FROM eav_attribute where attribute_code = 'school';

If that is correct, it might me a misconfiguration of the Source, check the source_model is correct.

This post may help you to understand and fix your attribute (re)source model.

That happens when the source of the attribute is misconfigured, or the entity_type of that attribute is not set.

Search in your database, in the table eav_attribute your attribute by attribute_code and take a look if the entity_type is correct (for example, catalog_product, in case of product attributes).

SELECT entity_type_id, backend_model, source_model FROM eav_attribute where attribute_code = 'school';

If that is correct, it might me a misconfiguration of the Source, check the source_model is correct.

This post may help you to understand and fix your attribute (re)source model.

That happens when the source of the attribute is misconfigured, or the entity_type of that attribute is not set.

Search in your database, in the table eav_attribute your attribute by attribute_code and take a look if the entity_type is correct (for example, catalog_product, in case of product attributes).

SELECT entity_type_id, backend_model, source_model FROM eav_attribute where attribute_code = 'school';

If that is correct, it might me a misconfiguration of the Source, check the source_model is correct.

That happens when the source of the attribute is misconfigured, or the entity_typeentity_type of that attribute is not set.

Search in your database, in the table eav_attributeeav_attribute your attribute by attribute_codeattribute_code and take a look if the entity_typeentity_type is correct (for example, catalog_productcatalog_product, in case of product attributes).

SELECT entity_type_id, backend_model, source_model FROM eav_attribute where attribute_code = 'school';

If that is correct, it might me a misconfiguration of the Source, check the source_modelsource_model is correct.

This post may help you to understand and fix your attribute (re)source model.

That happens when the source of the attribute is misconfigured, or the entity_type of that attribute is not set.

Search in your database, in the table eav_attribute your attribute by attribute_code and take a look if the entity_type is correct (for example, catalog_product, in case of product attributes).

SELECT entity_type_id, backend_model, source_model FROM eav_attribute where attribute_code = 'school';

If that is correct, it might me a misconfiguration of the Source, check the source_model is correct.

This post may help you to understand and fix your attribute (re)source model.

That happens when the source of the attribute is misconfigured, or the entity_type of that attribute is not set.

Search in your database, in the table eav_attribute your attribute by attribute_code and take a look if the entity_type is correct (for example, catalog_product, in case of product attributes).

SELECT entity_type_id, backend_model, source_model FROM eav_attribute where attribute_code = 'school';

If that is correct, it might me a misconfiguration of the Source, check the source_model is correct.

This post may help you to understand and fix your attribute (re)source model.

Source Link

That happens when the source of the attribute is misconfigured, or the entity_type of that attribute is not set.

Search in your database, in the table eav_attribute your attribute by attribute_code and take a look if the entity_type is correct (for example, catalog_product, in case of product attributes).

SELECT entity_type_id, backend_model, source_model FROM eav_attribute where attribute_code = 'school';

If that is correct, it might me a misconfiguration of the Source, check the source_model is correct.

This post may help you to understand and fix your attribute (re)source model.