Making new flight plan

When I try to make a new flight plan that I haven't done before in flight simulator FSX I get an error message saying "File not found check the file name and try again" so now I'm stuck doing the same flight plans I've already created over and over. Can someone help me out here?

Are you using FSX-SE or Boxed version. If FSX-SE, I would suggest verifying your game cache. If you are running the boxed version have you unchecked any scenery areas in your Scenery Library?

 

To verify your game files please do the following:

 

1. Load the Steam platform and log into your account

2. Click the Library tab in the menu at the top of the screen

3. Click the List View from the view options on the top right of the screen

4. Right click on Microsoft Flight Simulator X: Steam Edition to bring up a popup menu

5. Click on Properties from the popup menu to bring up another popup box

6. Click on Local files from the popup box menu

7. Click on Verify integrity of game cache from the Local file options

8. Wait for the progress bar to finish verifying your files. Additional files may download

9. Restart Steam

10. Restart Microsoft Flight Simulator X: Steam Edition

I am using FSX-SE. Clicked verify integrity of game files and upon completion it said 96 files failed to validate and would be required. Does this mean I need to uninstall and reinstall to reaquire these files?