fix path

src/objective/regression_obj.cu

@@ -656,8 +656,6 @@ class MeanAbsoluteError : public ObjFunction {
     return std::max(static_cast<std::size_t>(1), info.labels.Shape(1));
   }
 
-#include "common/gpu_error_check.h"
-
 void GetGradient(HostDeviceVector<float> const& preds, const MetaInfo& info,
                  std::int32_t iter, linalg::Matrix<GradientPair>* out_gpair) override {
   std::cerr << "Entering GetGradient, iteration: " << iter << std::endl;