Unity Editor doesn't open and gives the error below

Questions & Answers
1

Hi,

I have been working on Unity3D from past six months and had created some simple projects since then. Nowadays while opening some of the projects which were opening without any hiccups before, it gives me the error as in the image below while opening them.

Sometimes I get this error :

8849-screenshot_one.png

and sometimes this:

8850-screenshot_two.png

What could be the possible reason for it and how can I overcome?

Any help is appreciated.

2

Even after uninstalling and re-installing Unity the problem persisted(Unity 3.5). Could not figure out what the problem was.

Now using Unity Version 4.0.1f2 and it is working fine.
No issues.

Thank you