It seems that this bug is introduced between 1.1.2 - 1.1.4. I have downgraded Seeed nRF52 Boards to 1.1.1 and it compiles now.
It seems that this bug is introduced between 1.1.2 - 1.1.4. I have downgraded Seeed nRF52 Boards to 1.1.1 and it compiles now.