Thank you Mr.Sudhindra,
I actually do not know why the problem has come. I have taken the consolidated file which is downloaded from TIN website, opened in RPU Version 2.6, revised and saved. Subsequently when I was told that the FVU file has to be created in RPU 2.7, I have opened the already corrected and saved file in RPU 2.7 and tried creating FVU in 2.7 version. Then the above said error has come.
Now I have opened the original downloaded consolidation file in RPU 2.7, made all the corrections again and then created FVU file. Then I did not get any errors and I was able to crete the FVU file successfully.
Anyhow thanks for replying my query.