[SOLVED] Error planning calculation : unplanned work - by: bvd

Hi,

I'm on 7.4.2.

When I try to add a meeting with assigned resources, I get an error "unplanned work" ("travail non planifié" en français).

If I delete the meeting and I put a task instead, it works. If i put the meeting again, it failed.

I dont know if I am missing some step or trick.

Any Help will be welcome

Regards,