NO SOLDER MASK in RIGID-FLEX pcb --> ALTIUM ERROR ??

[LACluc]

Hello all,
I am working in a 3 layer RIGIDFLEX pcb. RIGID pcb = 3 layer, FLEX=1 layer
Altium version = 20.2.3
I am placing components en the flex pcb (Mid layer) but the solder mask is not shown, someone know how to solve it ?

I have tried to add BIKINI COVERLAY in the stack manager but nothing happend.

[LACluc]

It is solved !!!!
The problem was that is necesary to uncheck the old overlays.