Class file has wrong version 51.0,should be 49.0

Dear All,
I have 2 jdk in my computer, one is 1.7 and another is 1.5. I got a eclipse from my co-worker, checkout project from svn, complied it successful. However, there is error : class file has wrong version 51.0，should be 49.0 when I run it in eclipse( this is google gwt project).
One of my colleague said I should modify one cache file under the eclipse direcotry, but he forgot the loaction of this file.
Anyone knows?

After modified this file : org.eclipse.jdt.launching.prefs under : <project folder>\.metadata\.plugins\org.eclipse.core.runtime\.settings,
this problem has been fixed.
The modification is :
add
<libraryLocations>\r\n<libraryLocation
jreJar\="D\:/Java/jdk7/jre/lib/resources.jar"
jreJavadoc\="http\://docs.oracle.com/javase/7/docs/api/"
jreSrc\="D\:/Java/jdk7/src.zip" pkgRoot\=""/>\r\n
to it.
eclipse is :
Eclipse Java EE IDE for Web Developers.
Version: Luna Release (4.4.0)
Build id: 20140612-0600
my questions are :
1. what is this file used for?
2. when use this file?
3. why I have to add these information to it by hand rather than generate these automatically when I set jdk in eclipse preference?
4. why this error occur if this file doesn't has <libraryLocations> when running project(the project compile success before running)?

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Class file has wrong version 51.0,should be 49.0

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