Unable to run NetBeans/JPA Web Application Tutorial

I followed each and every step of NetBeans/JPA Web Application Tutorial but when i am trying to run the web application the following error is prompted on the run console:

Start is in progress...
start?path=/GuestBook
FAIL - Application at context path /GuestBook could not be started
C:\GuestBook\nbproject\build-impl.xml:1050: The module has not been deployed.
See the server log for details.
BUILD FAILED (total time: 2 minutes 13 seconds)

Hoping somebody can help! Thank You!

Please follow the instructions in the error message and check the server log for details.

You may also try downloading and running the tutorial, if following step by step doesn't work.