I am trying to decrypt a dvd and am getting follwoing error even after skip read errors with dvd decrypter

W 09:53:59 Failed to read Sector 2033155 - Illegal Mode For This Track
W 09:54:00 Failed to read Sector 2033156 - Illegal Mode For This Track
W 09:54:02 Failed to read Sector 2033157 - Illegal Mode For This Track
W 09:54:03 Failed to read Sector 2033158 - Illegal Mode For This Track
W 09:54:05 Failed to read Sector 2033159 - Illegal Mode For This Track

I tried to use vstrip, cladvd xp but still the same...

Can somebody please advice as to how to move forward. I tried ignore read errors but it still is the same...

I have a lot of dvds which are giving this problem... The movie lengths are 2:30 hrs (nearly)

Thanks for the help...