Error while importing to ADT Eclipse

[esnho]

Hi, I would like to use your library for an academic project at the "Accademia di Carrara" in Italy.
I've got problem during the import of the library in ADT Eclipse, I get an error window and all the imported projects come with an exclamation mark on the project except DroidAR wich has an error in the system.EventManager class at line 123, the error says: "TYPE_ROTATION_VECTOR cannot be resolved or is not a field"
But maybe this last error is caused by bad importing in ADT.

Thank you.

I attach an image and I write you down what I get:

(https://cloud.githubusercontent.com/assets/2782780/2625893/dafb5d8e-bdae-11e3-94ee-dd4b8c5b8dc6.png)

eclipse.buildId=v22.3.0-887826
java.version=1.7.0_51
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=it_IT
Framework arguments: -product com.android.ide.eclipse.adt.package.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product com.android.ide.eclipse.adt.package.product

Error
Sun Apr 06 19:03:19 CEST 2014
New Project Wizard failed

java.lang.reflect.InvocationTargetException
at
com.android.ide.eclipse.adt.internal.wizards.newproject.NewProjectCreator.createProjectAsync(NewProjectCreator.java:677)
at com.android.ide.eclipse.adt.internal.wizards.newproject.NewProjectCreator.access$0(NewProjectCreator.java:590)
at com.android.ide.eclipse.adt.internal.wizards.newproject.NewProjectCreator$3.execute(NewProjectCreator.java:400)
at org.eclipse.ui.actions.WorkspaceModifyOperation$1.run(WorkspaceModifyOperation.java:106)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
at org.eclipse.ui.actions.WorkspaceModifyOperation.run(WorkspaceModifyOperation.java:118)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)
Caused by: Java Model Exception: Core Exception [code 274] Could not set the project description for 'ModelLoaderAdapters' because the project description file (.project) is out of sync with the file system.
at org.eclipse.jdt.internal.core.ProjectReferenceChange.updateProjectReferencesIfNecessary(ProjectReferenceChange.java:113)
at org.eclipse.jdt.internal.core.ChangeClasspathOperation.classpathChanged(ChangeClasspathOperation.java:59)
at org.eclipse.jdt.internal.core.SetClasspathOperation.executeOperation(SetClasspathOperation.java:74)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:728)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:793)
at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject.java:3095)
at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject.java:3057)
at org.eclipse.jdt.internal.core.JavaProject.setRawClasspath(JavaProject.java:3110)
at com.android.ide.eclipse.adt.internal.wizards.newproject.NewProjectCreator.setupSourceFolders(NewProjectCreator.java:1400)
at com.android.ide.eclipse.adt.internal.wizards.newproject.NewProjectCreator.createEclipseProject(NewProjectCreator.java:767)
at com.android.ide.eclipse.adt.internal.wizards.newproject.NewProjectCreator.createProjectAsync(NewProjectCreator.java:660)
... 6 more