Probably there is an error in the file. You can open the file by a text editor and to inspect it. I'm using notepad++ for such purposes. If you cannot find the error, try to cut the file in several parts and test them one by one.

It worked!     But now I found a new problem. have more than 9000 candlesticks in that file belonging to the period 01/01/2005 until yesterday, but the program can't identify more than 1593!! 

I want to check a strategy for the last 5 years and I don't know why so few are identified when I select that period. I see that 1400 are identified for 2009, but only 300 are identified for all previous yeras...always!! I reopened the file and checked that every year has mor than 1900 entries. I can't guess what's happening.

Could you help me again, please?

Thanl you very much in advance.

Have you tried to cut off bad data via the >Market toolbar menu item?

Have you also tried to use other timeframes to reduce the Ambiguous bars?  You can do this by clicking on the Scanner button.