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I am trying to save to attribute in attribute set but getting error like

An error occurred while saving the attribute set

can anyone help.

In Exception Log file getting below error

Exception message: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '0' for key 'PRIMARY', query was: INSERT INTO eav_attribute_label (attribute_id, store_id, value) VALUES (?, ?, ?)

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I got answer for this myself. In database eav attribute tables primary key column was not set for auto_increment attribute. After set the auto_increment problem solved.

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