Unable to edit Webdynpro views

Hi,
I'm facing a strange problem. I've checked-out my Webdynpro dc from DTR. Now, I want to make some changes in the code, but whenever i try to write anything, it is not displayed in the screen, i.e. it is not allowing me to make modification. I've checked the read-only property of view and it is un-checked.
1) Could you plz tell me what is wrong with the DC?
2) Why it is not allowing me to make any modification?
PS: I'm using NW04 SP16
Thanks & Regards
Abhinav

Hi Akshaya,
Thanks for ur response. But i've tried it earlier but it is of no use. Still my problem persists
Thanks
Abhinav Sharma

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START LOG EXCERPT
500 Internal Server Error is returned for HTTP request [https://xxx.xxx.xxx:443/webdynpro/resources/sap.com/pb/PageBuilder]:
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CSN component[BC-WD-JAV],
problem categorization [],
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