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Thanks for your help. I fixed the problem. Although its the WSR members route, I've made some updates to it. I found it was one of the lofts on the tile that was causing this problem.
I've now got the route up and running again and can carry on with updating it. But I don't know exactly what loft it didn't like. I think it was one of the embankments. Thanks for your time anyway.

One of the loft I used must of got corrupted on that tile. I redid the area and now it works fine. Thankfully. . Hopefully not long now I can finish the route.