Upgrade CP with JUpgrade doesn't work.

JUpgrade with the jupgrade_plugins don't migrate the CP tags, after migration the menus "Manage Custom Properties" and "assigned tags" are empty. (Yes, the two files of jupgrade_plugins are into administrator/components/com_jupgrade/extensions directory)
I try with 1.7 and 2.51 joomla upgrading version and the result is the same.

Version of custom properties 1.5 and 2.1 are the latest. JUpgrade lastest version (2.51)
Tested on online and local instalation.

What should i do ?

The upgrade procedure has not been tried and tested with the latest version of Jupgrade for J2.5. Chances are that the plugins we developed are not suitable for the latest version of JUpgrade. We'll make compatibility tests in the coming days and post our results here.

Thank you very very much Andrea