I tried to connect to my Oracle database and entered the correct password and received the following messages:

Failed to open the connection.

Details: ORA-12154: TNS: could not resolve the connect identifier

1. unspecified.

(Database Vendor Code 12154)

Failed to open connection

Details: (Database Vendor Code 12154)

About Crystal Reports:

CR Developer

Version: 12.0.0.683

Product Type: Full

This product is registered to : Aluminum Precision Products

Registration Number: 8886439509

Keycode: CFK00-EFRZS2M-00UFAFF-N43M

The location of my TNSNAMES:

C:\oracle\product\10.2.0\client_1\NETWORK\ADMIN

TNSNAMES:

# tnsnames.ora Network Configuration File: D:\oracle\product\10.2.0\client_1\network\admin\tnsnames.ora

# Generated by Oracle configuration tools.