Dear Pham,
Exactly when do you get the “file does not exist” error ?
Do you get it when you drop the FCPXMLD into the source window on the application ?
If you do then the FCPXMLD is probably embedded inside another FCPXMLD.
Copy the FCPXMLD to your desktop.
create a folder called Test on your desktop.
Using finder look at the FCPXMLD, right click and select “show package contents”
What do you see ? Do you see another FCPXMLD ?
If you do then “show package contents” on this, you should then see a info.fcpxml
copy this info.fcpxml into the “Test” folder.
Import the info.fcpxml into the X2Pro source window.
Yours Sincerely
James