Please try this...
Try these Steps:
Run upgrade.bat to update schema to new version:
1- Stop the Symantec Endpoint Protection Manager services;
click in start --> run --> type services.msc --> stop the Symantec Endpoint Protection Manager
2- Go to <local drive>\Program Files\Symantec\Symantec Endpoint Protection Manager\bin\upgrade.bat
Let all upgrade process finish and reopen console Manager. Generally the SEPM services starts after upgrade done.
OR
1) Remove all old packages from SEPM.
- Log into SEPM
- Click in the Tab: Admin > Install Packages and select the old packages with right click and select the option delete;
- After you remove all the old packages, log off from SEPM.
2) Click on Start > Run and type the following command ''services.msc'' to open the services management:
- Stop the service ''Symantec Endpoint Protection Manager''; (Keep it open)
3) Open the following direct <driver:>Program FilesSymantecSymantec Endpoint Protection ManagerBin and execute ''upgrade.bat'';
- Once you executed ''upgrade.bat'' start the service ''Symantec Endpoint Protection Manager'' and log on again into SEPM.;
Now you should be able to export the new packages.