Blank page in the browser after deployment

Hi, i'm working with an ADF application development . Testing the application with the Jdev built in server. It was running for all these days and suddenly starting last evening the deployments gives blank page in the brower. No errors were given in the server logs. I undid all the changes that i made and still same blank page and no errors.
Can some one help me to trouble shoot this. Thanks .

i tried to copy the working code from history . But that didn't solve the problem .
Right click on the file name from Application Navigator , and under Versioning , there is an option called "Undo Changes" solved the issue.
I still didn't get the reason, because i did the same by coping the code from history. But that didn't work.

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