Fixing the 422 UNPROCESSABLE ENTITY The specified extension <'ext_name'> is not present in shared_preload_libraries error
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Updated at December 17, 2025
Issue description
When trying to install the required database extension following this guide, you get this error:
«422 UNPROCESSABLE ENTITY The specified extension 'EXT_NAME'
is not present in shared_preload_libraries.»
Solution
This error states that the EXT_NAME flag is not set in the cluster.
To set it, navigate to Cluster overview → Edit cluster → DBMS settings → Shared preload libraries and select EXT_NAME. After that, you will be able to install your extension.
Alert
Applying changes to the cluster settings will cause the PostgreSQL server to reboot.
For more details on managing extensions, see this guide.