There is no cache at the given coords, the cache is near the start of the challenge in Horton-In-Ribblesdale.
You have to visit Horton-In-Ribblesdale before tackling any of the Peaks.
The Yorkshire Three Peaks Wherigo Challenge
Visit the summits of Pen-y-ghent, Whernside and Ingleborough with the Wherigo Cartridge running at each, and return to the start, all within 12 hours, to unlock access to the Challenge Cache, and to join the elite Yorkshire Three Peaks Wherigo club.
Please refer to the Reward Cache listing for full details on the Challenge.