Jdeveloper not able to start: Caused by: org.xml.sax.SAXParseException: : XML-20108: (Fatal Error) Start of root element expected.

Some times it happened that Jdeveloper is not able to start or you create a new application/project in Jdeveloper you are getting the following error:

Caused by: org.xml.sax.SAXParseException: <Line 1, Column 1>: XML-20108: (Fatal Error) Start of root element expected.

And application/project is not created.
I got this error while creating the SOA project in jdeveloper 11.1.1.7.0.

Solution:

1. Go to the system folder i.e C:\Users\username\AppData\Roaming\JDeveloper\system11.1.1.7.40.64.93
2. Delete the system folder.
3. Restart Jdeveloper.

Note: This is just a workaround of this problem. After deleting the system folder you will loose some information like database connection details, MDS connection details, in that case you have to create all those required connection again.