Fail to set kernel arguments, error code -38 returned

[CanYing0913]

Hi there. I am new to OpenCL, so I thought I will start by writing a small kernel to see if it works:

// kernel.cl
__kernel void kernel(__global float* ez, int t, int H, int L, int W) {
    float ddx, dt;
    float fre = 1e9;
    int is, js, ks;

    ddx = 0.01;
    dt = ddx / 6e8;
    is = H / 2;
    js = L / 2;
    ks = W / 2;

    float value = sin(2 * M_PI * fre * dt * t);

    ez[is * L * W + js * W + ks] = value;
}

My main program main.cpp:

    int t = 10;
    int H = 100, L = 100, W = 100;
    size_t size = H * L * W * sizeof(float);
    float *ez = (float *)malloc(size);
    // OpenCL context setup and kernel reads skipped
    cl_mem ez_mem = clCreateBuffer(context, CL_MEM_READ_WRITE, size, NULL, &err);
    CHECK_ERROR(err, "Failed to create buffer for ez");
    err = clEnqueueWriteBuffer(queue, ez_mem, CL_TRUE, 0, size, ez, 0, NULL, NULL);
    CHECK_ERROR(err, "Failed to write data to buffer ez");
    err = clSetKernelArg(kernel, 0, sizeof(cl_mem), &ez_mem);
    err |= clSetKernelArg(kernel, 1, sizeof(int), &t);
    err |= clSetKernelArg(kernel, 2, sizeof(int), &H);
    err |= clSetKernelArg(kernel, 3, sizeof(int), &L);
    err |= clSetKernelArg(kernel, 4, sizeof(int), &W);
    CHECK_ERROR(err, "Failed to set kernel arguments for kernel()");

The error I got:

$ ./opencl_program
Failed to set kernel arguments for kernel(): -38

I also invoked CHECK_ERROR() after setting up the memory buffer and writing to it, and those did not raise any error. What could be the cause of the issue? Thank you.