sunrise : plpgsql language error

1.      We installed language ‘plpgsql’ using following command line in cygwin console in window 2000.

createlang -h localhost -p 5432 -U mna  plpgsql master

2.      Then, we create a function using plpgsql language

3.      When we execute that function, the following error is occurred.

 PgAdmin2 Errorè

“No response from the backend;

            Error while reading from the socket.”

     How should we solve this problem and what are the possible cause? Please kindly reply to us.

Thanks in advance,

Sunrise Company Ltd.