[Migration to v2.6.1] error gatt_dm.c:96: undefined reference to `k_calloc'

[MartKano]

I'm migrating from ncs v2.3.0 to ncs 2.6.1 in order to have the ram retetion working with the mcu boot.

But after some modification on my board file using a nrf5340 I get this error that I don't get the meaning:

C:/ncs/v2.6.1/nrf/subsys/bluetooth/gatt_dm.c:96: undefined reference to `k_calloc'

Do you have any input on this ? 

Thanks in advance

Best regards.

Martin.

[MartKano]

So answering my self if it can help : 

Introducing 

CONFIG_HEAP_MEM_POOL_SIZE=256 

 makes it work.