Unable to connected to 'jdbc:postgresql://localhost/xnat'

jalal@klein:~/computer_vision/XNAT/xnat$ vi build.properties
jalal@klein:~/computer_vision/XNAT/xnat$ ./bin/setup.sh

Using XDAT Installation: /home/jalal/computer_vision/XNAT/xnat
Using JAVA_HOME:         /usr/lib/jvm/java-8-openjdk-amd64/

Verify Java Version (with java -version)
openjdk version "1.8.0_91"
OpenJDK Runtime Environment (build 1.8.0_91-8u91-b14-3ubuntu1~15.10.1-b14)
OpenJDK 64-Bit Server VM (build 25.91-b14, mixed mode)

Executing /home/jalal/computer_vision/XNAT/xnat/plugin-resources/maven-1.0.2/bin/maven xdat:setup
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|  \/  |__ _Apache__ ___
| |\/| / _` \ V / -_) ' \  ~ intelligent projects ~
|_|  |_\__,_|\_/\___|_||_|  v. 1.0.2

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build:start:

xdat:setup:
    [echo] HOME: /home/jalal/computer_vision/XNAT/xnat
xdat:version:
    [echo] Setting the project version
    [echo] Setting project version to: 1.6.5
Unable to connected to 'jdbc:postgresql://localhost/xnat'
Please resolve the PostgreSQL issue (specified below).

BUILD FAILED
File...... /home/jalal/computer_vision/XNAT/xnat/maven.xml
Element... ant:TestDB
Line...... 1489
Column.... 183
FATAL: password authentication failed for user "postgres"
Total time: 6 seconds
Finished at: Fri Sep 02 14:38:29 CDT 2016