still no solution to throwable error?

doing multiple projects for college.

saved the projects and the enxt time i try to open them, the following pops up.

Unable to load world: S:\alice programming\ninja wa\ninja2.a2w


Alice version: 2.2 09/10/2010

Throwable that caused the error:
java.util.zip.ZipException: invalid CEN header (bad signature)
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(Unknown Source)
at java.util.zip.ZipFile.<init>(Unknown Source)
at edu.cmu.cs.stage3.io.ZipFileTreeLoader.open(ZipFil eTreeLoader.java:66)
at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.loadWorld(AuthoringTool.java:1945)
at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.loadWorld(AuthoringTool.java:1912)
at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.showStartUpDialog(AuthoringTool.java:1329)
at edu.cmu.cs.stage3.alice.authoringtool.AuthoringToo l.openWorld(AuthoringTool.java:1361)
at edu.cmu.cs.stage3.alice.authoringtool.Actions$2.ac tionPerformed(Actions.java:92)
at javax.swing.AbstractButton.fireActionPerformed(Unk nown Source)
at javax.swing.AbstractButton$Handler.actionPerformed (Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed (Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unk nown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mou seReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent( Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(U nknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unkno wn Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilter s(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(U nknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

it has happened every time for the last three weeks on three seperate projects

the backs up do not even work.

[aikmin]

can you please share your ninja2.a2w file so we can try to see what is wrong?

added and i can confirm it was working perfectly fine the week before i retried to open it.

[reuben2011]

Based on what the little I know about error trying, catching, and throwing; something either happened between here:

at edu.cmu.cs.stage3.alice.authoringtool.Actions$2.actionPerformed(Actions.java:92)
at javax.swing.AbstractButton.fireActionPerformed(Unk nown Source)

or here

at java.util.zip.ZipFile.<init>(Unknown Source)
at edu.cmu.cs.stage3.io.ZipFileTreeLoader.open(ZipFil eTreeLoader.java:66)

or here

java.util.zip.ZipException: invalid CEN header (bad signature)
at java.util.zip.ZipFile.open(Native Method)

What it means, I don't know. Sorry.

[jediaction]

This problem is unfixable. You could try opening the project on different versions of alice but sorry, this is unfixable. This happened to me with a really big file. I know how it feels, but this stuff is common. Go to the earliest backup you can. But, whatever you added that was odd or was imported. Dont import it!