AMD Radeon R7 260X is Bonaire so it should work.
What error do you get, paste it here, or create a screenshot.
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[2018-10-11 18:36:33] Miner version: 1.6.8
[2018-10-11 18:36:33] Windows version: 6.1 build 7601
[2018-10-11 18:36:33] Video driver version: 24.20.11021.1000
[2018-10-11 18:36:34] AMD Platform ID: 0
[2018-10-11 18:36:34] AMD platform FOUND
[2018-10-11 18:36:34] Found 2 AMD devices
[2018-10-11 18:36:34] CPU AES-NI: TRUE
[2018-10-11 18:36:34] GPU0: AMD Radeon R9 200 Series [hawaii] [4096 MB][Intensity 64.0][W: 8][T: 2][K: 1][BUS: 7]
[2018-10-11 18:36:34] GPU1: AMD Radeon (TM) R9 390 Series [hawaii] [8192 MB][Intensity 64.0][W: 8][T: 2][K: 1][BUS: 1]
[2018-10-11 18:36:34] ADL is enabled
[2018-10-11 18:36:34] Cryptonight LiteV7 mode enabled
[2018-10-11 18:36:34] Starting init of mining threads
[2018-10-11 18:36:34] Heating up system, please wait...
[2018-10-11 18:36:34] Created OCL context
[2018-10-11 18:36:34] Created OCL command queue for DeviceID 0 (Thread 0)
[2018-10-11 18:36:34] Created OCL input buffer for DeviceID 0 (Thread 0)
[2018-10-11 18:36:34] Created OCL output buffer for DeviceID 0 (Thread 0)
[2018-10-11 18:36:34] Compiling kernel for DEVICE BUS ID 7 ...
[2018-10-11 18:36:39] Created OCL command queue for DeviceID 0 (Thread 1)
[2018-10-11 18:36:39] Created OCL input buffer for DeviceID 0 (Thread 1)
[2018-10-11 18:36:39] Created OCL output buffer for DeviceID 0 (Thread 1)
[2018-10-11 18:36:39] Loading kernel for DEVICE BUS ID 7 ...
[2018-10-11 18:36:40] Created OCL command queue for DeviceID 1 (Thread 2)
[2018-10-11 18:36:40] Created OCL input buffer for DeviceID 1 (Thread 2)
[2018-10-11 18:36:40] Created OCL output buffer for DeviceID 1 (Thread 2)
[2018-10-11 18:36:40] Loading kernel for DEVICE BUS ID 1 ...
[2018-10-11 18:36:40] Created OCL command queue for DeviceID 1 (Thread 3)
[2018-10-11 18:36:40] Created OCL input buffer for DeviceID 1 (Thread 3)
[2018-10-11 18:36:40] Created OCL output buffer for DeviceID 1 (Thread 3)
[2018-10-11 18:36:40] Loading kernel for DEVICE BUS ID 1 ...
[2018-10-11 18:36:40] ADL initialised successfully!
[2018-10-11 18:36:40] Finished init of mining threads