OpenCL struct argument invalid address space

I'm a total beginner with OpenCL and I'm trying to make the following kernel to work. When I run the program I get an error in the build process of the kernel program. More specificity the error is the following: ``` Error: Failed to build program executable! <program source>:19:64: error: invalid address space for argument to __kernel function __kernel void accelarate_flow(__global const t_param params, ^ ``` You can see the kernel here. In the beginning I though that it was because I hadn't the structs defined inside the kernel but even when I added them the problem still exists. What am I doing wrong here? ``` const char *accelerate_flow_kernel_source = #pragma OPENCL EXTENSION cl_khr_fp64 : enable typedef struct { int nx; int ny; int maxIters; int reynolds_dim; double density; double accel; double omega; } t_param; typedef struct { double speeds[9]; } t_speed; __kernel void accelarate_flow(__global const t_param params, __global const int* obstacles, __global t_speed* cells, const unsigned int count) { int pos = get_global_id(0); if(pos >= count || pos % params.nx != 0) return; double w1,w2; w1 = params.density * params.accel / 9.0; w2 = params.density * params.accel / 36.0; if(!obstacles[pos] && (cells[pos].speeds[3] - w1) > 0.0 && (cells[pos].speeds[6] - w2) > 0.0 && (cells[pos].speeds[7] - w2) > 0.0 ) { cells[pos].speeds[1] += w1; cells[pos].speeds[5] += w2; cells[pos].speeds[8] += w2; cells[pos].speeds[3] -= w1; cells[pos].speeds[6] -= w2; cells[pos].speeds[7] -= w2; } } ```