[SQL] backend error

[Judith Altamirano Figueroa]

Hello everybody I have a failure making a select in a table the error that returns is the follow:

Backend message type 0x44 arrived while idle
pqReadData() -- backend closed the channel unexpectedly.
        This probably means the backend terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.

How can I do to fix the failure?