[Answered ]-Django.db.utils.ProgrammingError: type "int4range" does not exist

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Range fields in postgresql are available from version 9.2 (as mentioned here, they were introduced in 9.2), so you can’t use them on 9.1.13 because they aren’t there.

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Range data types were added in PostgreSQL 9.2. You are using 9.1.13.

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