PostgreSQL Upgrade Issue - Undefined Symbol Error

[Vivek Gadge <vvkgadge56@xxxxxxxxx>]

Hi All, 

I am encountering an error after completion of PostgreSQL upgradation from version 13.8 to 15.6. Trying to describe a single table, I am receiving an error. 

psql -d xyz

-->> \dt student*

The error message is as follows:

```

psql: symbol lookup error: psql: undefined symbol: PQmblenBounded

```

Could you please assist in resolving this issue?

Thanks and regards,

Vivek Gadge