Activate stuck when making a co-simulation with Flux [Error]

Hi Community,

Recently there was a request asking why sometimes Activate gets stuck during co-sim with Flux (both in v2021.1), like this below (without plots and fail message during the simulation):

The problem is in convergence of Flux block at initialization time . Activate observes that the output of the Flux system doesn't converge, i.e., it returns different values at each consecutive calls. 

With it we've concluded that the input of Flux Block was wrong, after changing it, we'd have the correct input, then the convergence, getting the expected result:

Soon we'll have a really nice improvent regarding messages on the UI for the user (thanks @Masoud for that help) on co-sim with Flux, stay tuned.