Error building platform after SDK upgrade


I recently upgraded SDK version to 19.05. I installed the architecture pack (Architecture 7.9.0, Pack UI 11.0.0, , HAL 2.0.0, FS 4.0.0), to the new SDK.

I then tried to import and build an already existing plaltform and I got the following error :
C:\Program Files\MicroEJ\MicroEJ-SDK-19.05\rcp\configuration\org.eclipse.osgi\26\0.cp\resources\microejgenerator\MicroEJGenerator.xml:46: The following error occurred while executing this line:
C:\Users.microej\workspaces\MicroEJ-SDK-ws\1.6\pd001\build\fragments\frontpanel\build\build.xml:67: Problem: failed to create task or type frontpaneldesigner.exportProject
Cause: The name is undefined.
Action: Check the spelling.
Action: Check that any custom tasks/types have been declared.
Action: Check that any / declarations have taken place.

What could have caused this error ?
Is there a way to solve this problem or do I need to roll back to the previous SDK’s version ?

You can’t use a XPFP UI < 11.1.0 on the SDK 19.05. The front panel plugin installed on this SDK is not compatible and this plugin is used during the platform build.

You have to use MicroEJ 4.1 with your configuration.