When ever  i export my file i get this nice error message.Do anyone know what's the way to fix it?

 

 

 

http://oi68.tinypic.com/bgd5d.jpg

I don't know for sure, but a couple of things that might help (or help other people help you)

 

1) Post an image (or two) showing measures 24-27 as you want them for the two guitar tracks

 

2) Try replacing the double dotted notes with their equivalent length in ties. Like in this image, so you'd replace a double dotted half with a half tied into a quarter tied into an eighth (or a dotted half tied into an eighth)

Like @@albatross213 mentioned, I think the issue is that GP5 format doesn't support double dotted notation so it can't export such notes.

I don't know for sure, but a couple of things that might help (or help other people help you)

 

1) Post an image (or two) showing measures 24-27 as you want them for the two guitar tracks

 

2) Try replacing the double dotted notes with their equivalent length in ties. Like in this image, so you'd replace a double dotted half with a half tied into a quarter tied into an eighth (or a dotted half tied into an eighth)

Well, i tried your secon method and i think it workd,thanks!

Like @@albatross213 mentioned, I think the issue is that GP5 format doesn't support double dotted notation so it can't export such notes.

Yes,most likely that was the issue.