After opening BLE with SDK->watch, these two files are missing.
The code wasn’t completely removed. Just delete these lines and it will be fine. Currently, the watch example only has graphics functionality and no Bluetooth-related code. If you want to add Bluetooth functionality to the watch, you can refer to the get-started\dualcore example in the main branch. It enables the Bluetooth switch, includes some reference Bluetooth application code, and incorporates compilation of the coprocessor project.
Dual-Core Comprehensive Example - SiFli SDK Programming Guide Documentation