and this is why I was trying to open the file and see if I could repair...

sophie le paih

I'm sorry... if you can't even provide the line in the TMX that is causing this problem how can we help you?  Screenshots from Studio won't help here.  The offending line is referenced so just copy the line out of the TMX so we can see it.

I am sorry Paul, I think I do not understand you, because precisely  I cannot find this line...(you may think I am dumb and I am definitely with SDL...) If I open the file, there are numbers for the lines, but I do not see this line...or there is something I do wrong...

sophie le paih

I don't think you're dumb at all... it's just very difficult guessing like this because I can't see the file.  Try drag and dropping the TMX file you have into a firefox browser.  Firefox is very good at reporting problems with XML and as TMX is essentially XML there may be something in the file causing a problem for Studio.

For example... I dragged a small TMX into the Firefox browser interface and it reports this:

Now I know exactly where the problem is and can correct it.  Try doing that and maybe this will help you locate the problem in the TMX.

thank you Paul for your advices, I give up for the moment, I will see later...have a good day!