light control mesh example not working

I'm trying to set up a ble mesh with 3 servers and 1 client on an nrf52 PCA10040 dev kit. Upon debugging, I'm getting an error that says: '64, APP_ERROR: C:\Users\sesa463145\Desktop\BLE\nrf5_SDK_for_Mesh_v0.9.2-Alpha\examples\light_control\client\src\main.c:301 code 15 code 15'

Also the button commands are not getting published on the servers. What should I do to rectify this issue?