Uninstall & reinstall Chrome.
Am I seeing it correctly ??
Now I am not able to open just one specific app that I want to open but I can open each and every apps now except that.
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It's corrupted..
Do you mean every one of his projects is corrupted?
No, only the specific one
Oh, I missed that post from him.
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Not able to export the aia too. 
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With that app, I can't -
- Open it
- Export it
- Publish it to gallery
except deleting it.
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Never experienced this but it may be because I do not use Chrome only Firefox..
Or you may try all the steps from the above
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Now shall i delete that and create again 
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Neither do I.
I have both browsers installed and use both. I've also worked on countless corrupt projects over the years, but I've never had the problem of not being able to export any of these projects (either with Chrome or Firefox).
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If it's not important, you may do so.. otherwise we can address this to MIT Team so they can manually extract it..
For me, I think it's important. But whether it's important or not, I want that app 
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I'll be looking into this at MIT. It does look like a corrupted project. It may take me a few hours to find the problem and correct it, and I may need additional information, in which case I will come back here.
-Jeff
It appears that you attempted to use an extension named "FloatingView" which I believe was written for Kodular. Uploading it into your project corrupted it, as it uses features not in MIT App Inventor. At this point I suggest deleting the project and starting over.
-Jeff
Yes, I created and tried to import it, but it didn't got imported instead got the same message as mentioned above. And thanks for your reply !
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@Aquib_Khan is it OK that @jis share your aia here as I would like to take a peek into it as I tried to import that extension with no issue..
I don't need the aia, I'm all set.
-Jeff