Hello,
I have made a mistake some where when trying to add new missions , aircrafts, pylons, ... Since that when I start ETO selecting ERA 1, 2, 3, 4 and 5 I see the Battle Map window 1945...
But the missions are in relation with the ERA selected ...
If I select ERA 1 I have the ERA 1 Missions , when I select ERA 2 I have the ERA 2 missions.....

How to correct?
Thanks in advance
Emile, you're simply stuck, corrupted. Your global layers may be corrupted, too. One way to determine this is to start in Era 1, go to QC and look for Spain under airfields. If Spanish airfields aren't in Era 1, you global layers are corrupted.
Here's the easy fix:
NOTE: This will remove all missions and spawns you have installed, but you can reinstall them afterwards (See below on this).
1. Go into the ETO main game folder and look for a folder named CFS3 ETO Expansion READMEs.
2. Look for a document named ERA Files Restore Rev 1.40.rtf.
3. Follow the procedure outlined in this readme exactly.
Thia will straighten it all out, but any missions and spawns you installed will be deleted.
Now, you can simply reinstall these per normal ETO procedure. Make sure you have again started ETO in Era 1 and exited, and settings Spawn Selector to 1 Stock Spawn Mode.
Here's a plus. Once you have all that done, and before starting ETO again, or switching Eras, run the ETO Backup icon. This will backup all of the files and folders named on the list in the ERA Files Restore Rev 1.40.rtf document.
Note: Here's a good idea. Once you have run the ETO Backup and have established an ETO Backup folder, simply install any new missions and spawns in the backup folder as well as into your ETO main game folder.
This way, if problems like this happen again, all you have to do is use delete the items from the list in the ERA Files Restore Rev 1.40.rtf document, and then copy and paste everything from the ETO Backup folder into your main game folder. This is good because the ORIFs re-installer on contains the stock ETO files and folders, and nothing that has been added by you.
Good luck.
Hope this helps.