Hi Kim,
Thanks for your reply.
My SU2KT plug-in and folder were in the right folder and I had the last version.
This morning I removed completly Kerkythea and all the plug-ins of the system and re-installed them for the third time. Now, all seem to be OK.
I really don't understand what was the problem yesterday. Maybe I was in a kind of "twilight Zone". ๐ฎ
Thank you