Web Reference: Nov 20, 2025 · One of the most common errors encountered when inserting array data is: ERROR: array value must start with "{" or dimension information. This error occurs when PostgreSQL expects an array input but receives data in an unrecognized format. This error occurs when you use incorrect syntax like square brackets [] or omit the opening brace entirely. Fix it by using proper PostgreSQL array syntax or the ARRAY constructor. Jul 20, 2015 · 65 Your column username seems to be an array type, so the literal 'mahman' is not valid input for it. It would have to be '{mahman}':
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